Relevant bibliographies by topics / Magnetic molecule

Academic literature on the topic 'Magnetic molecule'

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Published: 10 March 2023

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Journal articles on the topic "Magnetic molecule"

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RAMAN, KARTHIK V., NICOLAE ATODIRESEI, and JAGADEESH S. MOODERA. "TAILORING FERROMAGNET–MOLECULE INTERFACES: TOWARDS MOLECULAR SPINTRONICS." SPIN 04, no. 02 (June 2014): 1440014. http://dx.doi.org/10.1142/s2010324714400141.

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Understanding the interaction of organic molecules adsorbed on magnetic surfaces has shown considerable progress in recent years. The creation of hybridized interface between carbon-based aromatic molecule and the magnetic surface is observed to give rise to new interface states with unique electronic and magnetic character. This study has opened up a molecular-design initiative to tailor the spin dependent electronic and magnetic functionalities of the hybrid interface. The purpose of this article is to provide a fundamental understanding of the spin-chemistry and spin-physics associated with the formation of such ferromagnet-molecule hybrid interfaces. We also discuss the recent progress in this field using state-of-the-art experiments and theoretical calculations with focus on the magnetic properties of the molecule and the magnetic surface. The study reveals several interesting interface phenomena: formation of induced molecular moment and exchange coupling with the magnetic surface, and molecular spin-filters. It also demonstrates significant changes in the magnetic anisotropy and inter-atomic magnetic exchange coupling of the magnetic surface. These studies open the possibilities of exploring new molecular functionalities toward further research in the subfield of interface-assisted molecular spintronics.
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Zlatanova, Jordanka, and Sanford H. Leuba. "Magnetic tweezers: a sensitive tool to study DNA and chromatin at the single-molecule level." Biochemistry and Cell Biology 81, no. 3 (June 1, 2003): 151–59. http://dx.doi.org/10.1139/o03-048.

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The advent of single-molecule biology has allowed unprecedented insight into the dynamic behavior of biological macromolecules and their complexes. Unexpected properties, masked by the asynchronous behavior of myriads of molecules in bulk experiments, can be revealed; equally importantly, individual members of a molecular population often exhibit distinct features in their properties. Finally, the single-molecule approaches allow us to study the behavior of biological macromolecules under applied tension or torsion; understanding the mechanical properties of these molecules helps us understand how they function in the cell. In this review, we summarize the application of magnetic tweezers (MT) to the study of DNA behavior at the single-molecule level. MT can be conveniently used to stretch DNA and introduce controlled levels of superhelicity into the molecule and to follow to a high definition the action of different types of topoisomerases. Its potential for chromatin studies is also enormous, and we will briefly present our first chromatin results.Key words: single-molecules, chromatin, topoisomerases, magnetic tweezers, force.
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Laskowski, Lukasz, Iwan Kityk, Piotr Konieczny, Oleksandr Pastukh, Mateusz Schabikowski, and Magdalena Laskowska. "The Separation of the Mn12 Single-Molecule Magnets onto Spherical Silica Nanoparticles." Nanomaterials 9, no. 5 (May 18, 2019): 764. http://dx.doi.org/10.3390/nano9050764.

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The Mn12 single-molecule magnets (SMMs) could be attached to the surface of spherical silica for the first time with a high probability. This allowed separation of the individual molecular magnets and direct microscopic observation of the SMMs. We described in detail how to fabricate such a composite material. The synthesis procedure proposed here is simple and efficient. We confirmed the efficiency of the method by transmission electron microscopy (TEM): single-molecule magnets were visible at the surface of a silica substrate. Based on TEM observation, we described how the molecules anchor to the surface of silica (the geometry of the magnetic molecule in regard to the surface of the substrate). The SQUID magnetometry showed that single-molecule magnet behaviour is kept intact after grafting. The attachment of the single-molecule magnets to the surface of silica allows to investigate their properties as separate molecules. This is particularly important in the analysis of magnetic properties such as magnetic states of the separated SMMs, their mutual interactions, and the influence of a silica support.
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Wang, Bing-Wu, Zhe-Ming Wang, and Song Gao. "Organometallic Single-Ion Magnets." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C274. http://dx.doi.org/10.1107/s2053273314097253.

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The single-molecule magnets (SMMs) are attracting the increasing interesting due to their potential applications in high density information storage, quantum computing, molecular spintronics, and magnetic refrigeration. This field provides scientists a possible access into the crossover of the classical and quantum world, and a wonderful model to study the fascinating magnetic properties between microscopic and macroscopic materials, such as slow magnetization relaxation and quantum tunneling effect. After the milestone discovery of the first single-molecule magnets (SMMs) Mn12ac, many new SMMs were structurally and magnetically characterized. The most studied systems are mainly traditional coordination compounds with polynuclear structures. However, for the difficulties in the control of magnetic anisotropy and exchange coupling interactions of the cluster-type molecules, Mn12ac molecule is still one of the most important SMMs with the high relaxation barrier. From 2011 [1-3], we explored an organometallic sandwich molecule, Cp*ErCOT(Cp* = pentamethylcyclopenta-dienide; COT = cyclooctatetraenide), which behaves as a single-ion magnets, into the field of molecular nanomagnets. It opened a door of SMMs to the chemists in organometallic chemistry. Recently, we found some new sandwich or half-sandwich lanthanide organometallic molecules could also show the slow relaxation of magnetization. We hope these systems can provide new understandings of slow magnetic relaxation and new clues on the design and synthesis of molecular nanomagnets. This work was supported by NSFC, the National Basic Research Program of China.
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Wang, Bing-Wu, Xin-Yi Wang, Hao-Ling Sun, Shang-Da Jiang, and Song Gao. "Evolvement of molecular nanomagnets in China." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 371, no. 2000 (October 13, 2013): 20120316. http://dx.doi.org/10.1098/rsta.2012.0316.

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Molecular nanomagnets have been undergoing development for 20 years since the first single-molecule magnet (SMM), Mn 12 Ac, was characterized as the molecule-behaved magnet. The multi-disciplinary scientists promoted the magnetic characteristics to be more suitable for use in information science and spintronics. The concept of molecular nanomagnets has also evolved to include single-chain magnets (SCMs), single-ion magnets (SIMs) and even magnetic molecules that showed only slow magnetic relaxation, in addition to the initial cluster-type SMMs. In this review, several aspects, including SMMs, SCMs and SIMs, are introduced briefly through some representative examples. In particular, the contribution of Chinese chemists is highlighted in the design, synthesis and understanding of various types of molecular nanomagnets.
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Tyagi, Pawan. "Molecule Induced Strong Coupling between Ferromagnetic Electrodes of a Molecular Spintronics Device." Materials Science Forum 736 (December 2012): 32–54. http://dx.doi.org/10.4028/www.scientific.net/msf.736.32.

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Utilizing molecules for tailoring the exchange coupling strength between ferromagnetic electrodes can produce novel metamaterials and molecular spintronics devices (MSD). A practical way to produce such MSD is to connect the molecular channels to the electrodes of a magnetic tunnel junction (MTJ). This paper discusses the dramatic changes in the properties of MTJ testbed of a MSD due to molecular device elements with a net spin state. When organometallic molecular complexes (OMCs) were bridged across the insulator along the exposed side edges, a MTJ testbed exhibited entirely different magnetic response in magnetization, ferromagnetic resonance and magnetic force microscopy studies. OMCs only affected the ferromagnetic material when it was serving as the electrode of a tunnel junction. Molecule produced the strongest effect on the MTJ with electrodes of dissimilar magnetic hardness. This study encourages the validation of this work and exploration of similar observations with the other combinations MTJs and molecules, like single molecular magnet, porphyrin, and molecular clusters.
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Tyagi, Pawan, Christopher D'Angelo, and Collin Baker. "Monte Carlo and Experimental Magnetic Studies of Molecular Spintronics Devices." Nano 10, no. 04 (June 2015): 1550056. http://dx.doi.org/10.1142/s1793292015500563.

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Molecule-based spintronics devices (MSDs) are highly promising candidates for discovering advanced logic and memory computer units. An advanced MSD will require the placement of paramagnetic molecules between the two ferromagnetic (FM) electrodes. Due to extreme fabrication challenges, only a couple of experimental studies could be performed to understand the effect of magnetic molecules on the overall magnetic and transport properties of MSDs. To date, theoretical studies mainly focused on charge and spin transport aspects of MSDs; there is a dearth of knowledge about the effect of magnetic molecules on the magnetic properties of MSDs. This paper investigates the effect of magnetic molecules, with a net spin, on the magnetic properties of 2D MSDs via Monte Carlo (MC) simulations. Our MC simulations encompass a wide range of MSDs that can be realized by establishing different kinds of magnetic interactions between molecules and FM electrodes at different temperatures. The MC simulations show that ambient thermal energy strongly influenced the molecular coupling effect on the MSD. We studied the nature and strength of molecule couplings (FM and antiferromagnetic) with the two electrodes on the magnetization, specific heat and magnetic susceptibility of MSDs. For the case when the nature of molecule interaction was FM with one electrode and antiferromagnetic with another electrode the overall magnetization shifted toward zero. In this case, the effect of molecules was also a strong function of the nature and strength of direct coupling between FM electrodes. In the case when molecules make opposite magnetic couplings with the two FM electrodes, the MSD model used for MC studies resembled with the magnetic tunnel junction based MSD. The experimental magnetic studies on these devices are in agreement with our theoretical MC simulations results. Our MC simulations will enable the fundamental understanding and designing of a wide range of novel spintronics devices utilizing a variety of molecules, nanoclusters and quantum dots as the device elements.
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Czap, Gregory, Peter J. Wagner, Feng Xue, Lei Gu, Jie Li, Jiang Yao, Ruqian Wu, and W. Ho. "Probing and imaging spin interactions with a magnetic single-molecule sensor." Science 364, no. 6441 (May 16, 2019): 670–73. http://dx.doi.org/10.1126/science.aaw7505.

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Magnetic single atoms and molecules are receiving intensifying research focus because of their potential as the smallest possible memory, spintronic, and qubit elements. Scanning probe microscopes used to study these systems have benefited greatly from new techniques that use molecule-functionalized tips to enhance spatial and spectroscopic resolutions and enable new sensing capabilities. We demonstrate a microscopy technique that uses a magnetic molecule, Ni(cyclopentadienyl)2, adsorbed at the apex of a scanning probe tip, to sense exchange interactions with another molecule adsorbed on a Ag(110) surface in a continuously tunable fashion in all three spatial directions. We further used the probe to image contours of exchange interaction strength, revealing angstrom-scale regions where the quantum states of two magnetic molecules strongly mix. Our results pave the way for new nanoscale imaging capabilities based on magnetic single-molecule sensors.
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Zheng, Yan-Zhen, Guo-Jun Zhou, Zhiping Zheng, and Richard E. P. Winpenny. "Molecule-based magnetic coolers." Chem. Soc. Rev. 43, no. 5 (2014): 1462–75. http://dx.doi.org/10.1039/c3cs60337g.

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Coronado, Eugenio, Fernando Palacio, and Jaume Veciana. "Molecule-Based Magnetic Materials." Angewandte Chemie International Edition 42, no. 23 (June 16, 2003): 2570–72. http://dx.doi.org/10.1002/anie.200390487.

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Dissertations / Theses on the topic "Magnetic molecule"

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Beyene, Musie. "Magnetic field control of ultracold atom-molecule collision." Thesis, Durham University, 2011. http://etheses.dur.ac.uk/3196/.

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In this work we investigate the potential of controlling cold (O(K)−mK) and ultracold (mK-μK) atom-molecule collisions by tuning scattering states across Feshbach resonances using magnetic fields. We are interested in particular in the prospect of suppressing the often undesirable inelastic collisions. The He-O_2 system provides the vehicle for our study. We calculate bound and quasi-bound states of several isotopic combinations, including their Zeeman structure, to reveal the underlaying pattern for easier characterization of quasi-bound states in terms of rigorous and approximately good quantum numbers. These calculations also help us locate the fields at which zero-energy resonances will occur. Scattering calculations are then performed for collisions of 3^He and 4^He with {16}^O_2 at fixed (1 μK) energy but varying magnetic field. The field is varied to sweep the scattering state across resonance. At low and ultralow energies we enter the Wigner threshold regime where the S-partial wave dominates the wavefunction. The cross sections, and the real and imaginary parts of the scattering length, vary dramatically across resonance. Their profiles are used to analyze the resonances. In a highlight of our results we show that dramatic suppression of inelastic cross sections occur for 4^He-{16}^O_2 . The resonances are relatively wide (of order 100 Gauss), with suppression of inelastic scattering over a similarly wide range of fields and for temperatures ranging from 10 mK down to 1 μK. We conclude that under certain conditions it is possible to almost completely eliminate inelastic collisions. This is potentially very important for cooling techniques, such as evaporative and sympathetic cooling, that require efficient elastic cross sections. Suppression of inelastic collisions can not only increase thermalization efficiency but it can also result in longer trap-lifetimes by reducing transitions to untrapable states.
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Pedersen, Anders Hjordt. "Molecule-based magnetic materials of the ReIV ion." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28885.

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The [ReCl6]2-, [ReBr6]2- and [ReCl4(ox)]2- anions are crystallised with the organic 4,4’- bipyridinium dication (4,4-H2bipy). Magnetometry reveals exotic behaviour of the [4,4’- H2bipy][ReCl6] and [4,4’-H2bipy][ReBr6] salts which demonstrate spin-canting, antiferromagnetic exchange interactions and metamagnetism. Single crystal X-ray structures at T = 3, 14 and 20 K of the [4,4’-H2bipy][ReBr6] salt reveal the behaviour to be purely of magnetic origin as no structural changes are observed. For the [4,4’-H2bipy][ReCl4(ox)] compound an antiferromagnetic exchange interaction of 10.2 cm-1 between the anions is observed (Chapter 2). The complexes (NBu4)2[(ReCl5)2(μ-pyrazine)], (NBu4)2[(ReBr5)2(μ-pyrazine)], (NBu4)2[(ReBr5)2(μ-pyrimidine)] and (NBu4)2[(ReBr5)2(μ-triazine)] are structurally and magnetically characterised in Chapter 3. Magnetic measurements reveal the ReIV ions bridged by a 1,4-heterocyclic amine to exhibit strong antiferromagnetic coupling induced by the linearity of the bridging ligand. The two dimers bridged by a 1,3-heterocyclic amine exhibit intramolecular ferromagnetic exchange and at low temperature an intermolecular antiferromagnetic coupling is observed for the (NBu4)2[(ReBr5)2(μ-triazine)] complex due to the presence of short intermolecular Br···Br distances. Six molecular ReIVCuII chains of formula {[Cu(L)4][ReCl6]}n (L = imidazole, 1- methylimidazole, 1-vinylimidazole, 1-butylimidazole, 1-vinyl-1,2,4-triazole or dimethylformamide) are characterised structurally and magnetically in Chapter 4. SQUID magnetometry and theoretical calculations reveal the chains to exhibit ferromagnetic exchange interactions, which increase as the Re–Cl–Cu bond angle decreases. The {[Cu(vinylimidazole)4][ReCl6]}n chain exhibit magnetic order at TC = 2.4 K, and the {[Cu(imidazole)4][ReCl6]}n network exhibits ferrimagnetic behaviour. Eight complexes of the [ReCl6]2- and [ReBr6]2- anions crystallised with the [MII(L•)2]2+ (M = Fe, Co or Cu) or [Ni(L•)(CH3CN)3]2+ cations (L• = 4-dimethyl-2,2-di(2-pyridyl)oxazolidine N-oxide) are characterised structurally and magnetically in Chapter 5. The [Co(L•)2]2+ cation shows evidence of a gradual, thermally induced spin-crossover transition in variable-temperature magnetic and structural experiments. The [Ni(L•)(CH3CN)3]2+ cation show exchange of the coordinated acetonitrile molecules for atmospheric water upon drying. The nickel-radical magnetic coupling is ferromagnetic in all cases, demonstrating spin-canting behaviour with an ordering temperature of T = 2.7 K for the [ReCl6]2- based compound, and intermolecular antiferromagnetic exchange interactions for the [ReBr6]2- based complex.
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Romero, Javier. "Electronic transport and correlations in single magnetic molecule devices." Doctoral diss., University of Central Florida, 2014. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6348.

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In this dissertation, we study the most important microscopic aspects that grant molecules such as Single Molecule Magnets (SMMs) their preferential spin direction. We do so by proposing and solving a model that includes correlations between electrons occupying atomic orbitals. In addition, we study the relation between the non-equilibrium electronic transport signatures in a SMM model weakly coupled to a three-terminal single electron transistor device, and the interference features of the SMM model in the presence of a magnetic field. Finally, we investigate the equilibrium transport features in a giant-spin model of a SMM in the Kondo regime. We study how the magnetic field modulation of the energy in a highly anisotropic molecule can affect the conductance of the molecule in the Kondo regime.
Ph.D.
Doctorate
Physics
Sciences
Physics
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Luo, Guangpu. "Electron Transport via Single Molecule Magnets with Magnetic Anisotropy." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/87532.

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Single molecule magnets (SMMs) are molecules of mesoscopic scale which exhibit quantum properties such as quantum tunneling of magnetization, quantum interference, spin filtering effects, strong spin-phonon coupling and strong hyperfine Stark effects. These effects allow applications of SMMs to high-density information storage, molecular spintronics, and quantum information science. Therefore, SMMs are of interest to physicists, chemists, and engineers. Recently, experimental fabrication of individual SMMs within transistor set-ups have been achieved, offering a new method to examine magnetic properties of individual SMMs. In this thesis, two types of SMMs, specifically Eu2(C8H8)3 and Ni9Te6(PEt3)8, are theoretically investigated by simulating their electron transport properties within three-terminal transistor set-ups. An extended metal atom chain (EMAC) consists of a string of metallic atoms with organic ligands surrounding the string. EMACs are an important research field for nanoelectronics. Homometallic iron-based EMACs are especially attractive due to the high spin and large magnetic anisotropy of iron(II). We explore the exchange coupling of iron atoms in two EMACs: [Fe2(mes)2(dpa)2] and [Fe4(tpda)3Cl2]. Chapter 1 provides an introduction to SMMs, electron transport experiments via SMMs and an introduction to density functional theory (DFT). Chapter 2 presents a theoretical study of electron transport via Eu2(C8H8)3. This type of molecule is interesting since its magnetic anisotropy type changes with oxidation state. The unique magnetic properties lead to spin blockade effects at zero and low bias. In other words, the current through this molecule is completely suppressed until the bias voltage exceeds a certain value. Chapter 3 discusses a theoretical study of electron transport via Ni9Te6(PEt3)8. The magnetic anisotropy of this magnetic cluster has cubic symmetry, which is higher than most SMMs. With appropriate magnetic anisotropy parameters, in the presence of an external magnetic field, uncommon phenomena such as low-bias blockade effects, negative conductance and discontinuous conductance lines, are observed. In Chapter 2 and 3 DFT-calculated magnetic anisotropy parameters are used and electron transport properties are calculated by solving master equations at low temperature. Chapter 4 examines the exchange coupling between iron ions in EMACs [Fe2(mes)2(dpa)2] and [Fe4(tpda)3Cl2]. The exchange coupling constants are calculated by using the least-squares fitting method, based on the DFT-calculated energies from different spin configurations.
Ph. D.
Single molecule magnets (SMMs) are molecules of mesoscopic scale which exhibit quantum properties. Its quantum effects are used to describe the behavior of SMMs at the smallest scales. These quantum properties could also be used to reveal possible applications of SMMs to high-density information storage, molecular spintronics, and quantum information science. Thus SMMs are of interest to physicists, chemists, and engineers. Recently, electron transport via individual SMMs was achieved in experiments. Electron transport is obviously affected by the magnetic properties of the SMM, thus one can examine magnetic properties of an SMM indirectly by measuring electron transport via the SMM. In this thesis, two types of SMMs, Eu2(C8H8)3 and Ni9Te6(PEt3)8, are investigated theoretically by simulating their electron transport properties. An extended metal atom chain (EMAC) consists of a string of metallic atoms with organic ligands surrounding the string. EMACs are an important research field for nanoelectronics. Homometallic iron-based EMACs are especially attractive due to the high spin and large magnetic anisotropy of iron(II). If a molecule has magnetic anisotropy, its magnetic properties change with the direction of its magnetic moment. We explore how iron atoms interact with each other in the EMACs [Fe2(mes)2(dpa)2] and [Fe4(tpda)3Cl2]. Chapter 1 provides an introduction to SMMs, electron transport experiments via SMMs and an approximation method, density functional theory (DFT). DFT is a method to approximate electronic structure and magnetic properties of various many-body systems. Chapter 2 investigates theoretical electron transport via Eu2(C8H8)3. Eu2(C8H8)3 changes its type of magnetic anisotropy when it obtains an extra electron, which is different from most SMMs. If the Eu2(C8H8)3 is short of an extra electron, its magnetization direction is in-plane, that is, its magnetic energy is lowest when its magnetic moment is along any direction in a specific plane. If an extra electron is captured by Eu2(C8H8)3, its magnetization direction becomes out-of-plane, and its lowest energy is obtained when its magnetic moment is along the direction normal to the specific plane. The unique magnetic properties lead to blockade effects at low bias: the current through this molecule is completely suppressed until the bias voltage exceeds a certain value. The bias voltage on a molecule equals the electrical potential difference between two ends of the molecule. Chapter 3 investigates theoretical electron transport via Ni9Te6(PEt3)8. Magnetic anisotropy of Ni9Te6(PEt3)8 is cubic symmetric, and its symmetry is higher than most SMMs. With appropriate magnetic anisotropy parameters, in the presence of an external magnetic field, uncommon phenomena are observed. These phenomena include (1) current is completely suppressed when bias is low; (2) current via SMM decreases while bias on SMM increases; (3) there are discontinuous lines in the figures that describe electrical conductance of current. Chapter 4 examines the iron atoms’ interaction strength in both [Fe2(mes)2(dpa)2] and [Fe4(tpda)3Cl2]. Reasonable spin Hamiltonians are used to describe the energy of EMACs. Considering all possible directions of the spins of iron atoms in two EMACs, we calculate the energy of every possible spin configuration using DFT. The energy of each spin configuration can be expressed as an equation containing one or more coupling constants. We apply the least-squares fitting method to obtain the values of the coupling constants in the spin Hamiltonians.
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Pejaković, Dusan. "Optical control of magnetic order in molecule-based magnets." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343232538.

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Pejakovi?, Dušan. "Optical control of magnetic order in molecule-based magnets /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486572165278271.

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7

Li, Jia Hui [Verfasser]. "Magnetic manipulation of membrane molecule motion / Jia Hui Li." Berlin : Freie Universität Berlin, 2021. http://d-nb.info/1238074707/34.

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Bairagi, Kaushik. "Magnetic anisotropy and spin crossover at molecule-metal interfaces." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC241/document.

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L'utilisation de matériaux organiques pour l'électronique de spin suscite actuellement un fort intérêt. En effet, le long temps de diffusion de spin, la possibilité de manipuler l'état de spin d'une molécule ainsi que son interaction avec une surface magnétique offrent a priori de nouvelles possibilités pour la réalisation de nouveaux dispositifs d'électronique de spin. L'incorporation dans des dispositifs de molécules possédant deux états de spin nécessite la compréhension du phénomène de transition de spin une fois que les molécules sont en contact direct avec des surfaces métalliques.L'objectif de ce travail de thèse est l'étude des interfaces molécule-métal. Dans une première partie, nous avons étudié le magnétisme d'interfaces ferromagnétique-organique en utilisant différentes molécules et différents métaux ferromagnétiques. Nous nous sommes particulièrement intéresses a l'anisotropie magnétique dans ces systèmes. Dans une deuxième partie, nous avons étudié le phénomène de transition de spin moléculaire en contact avec une surface métallique. La spectroscopie d'absorption et le dichroïsme magnétique des rayons x ont d'abord permis de mettre en évidence cette transition à l'échelle globale ensuite, nous avons utilise la microscopie a effet tunnel pour étudier ce phénomène à l'échelle moléculaire dans un cristal 2d de molécule. Nous avons notamment observe la dynamique de la transition sous irradiation laser pour la première fois à l'échelle moléculaire
The use of organic materials in spintronic devices has recently raised a lot of interest. Large spin diffusion time in organic materials along with the flexibility of manipulating the spin state of the molecule and their interaction with the ferromagnetic metal electrode offers new functionalities in molecular spintronics. Understanding the spin crossover (sco) phenomenon for spin active molecules attached to metallic substrate is also necessary for a primary step towards device application.The main goal of the thesis work was to study these molecule—metal interfaces. In one part, we have studied the magnetism of the organic—ferromagnetic interface with different molecules and different ferromagnetic metals. The study was mainly focused on the magnetic anisotropy at the molecule-metal interfaces. In other part, we focused on the spin crossover phenomena of sco molecules attached to metallic substrates. X—ray absorption spectroscopy and magnetic circular dichroism techniques enabled us to study globally the spin crossover phenomenon. Using scanning tunneling microscopy we were able to study the sco phenomena at the single molecular level in a 2d crystal of molecules on a metal substrate. We have then studied locally the dynamics of the spin transition phenomenon upon laser exposure on a single 2d layer molecular crystal
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Li, Lihong. "The design and synthesis of new molecule-based magnetic materials." Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/45411/.

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Chapter One gives an overview of molecule-based magnetic materials, and a summary of topics of current interest in this field such as spin crossover (SCO), molecule-based magnets (particularly three room temperature metallo-organic magnets), Metallo-organic frameworks (MOFs), free radical magnets and single molecule magnets (SMMs). There is a brief introduction of key examples and developments in the specific topics, and a perspective at the end. Chapter Two introduces a family of optically pure Fe(II) polymeric chain complexes of formula {FeL2(μ-pz)}∞ and {FeL2(μ-bpy)}∞. [L = bidentate Schiff base ligands obtained from (R)-(+)-α-phenylethanamine and 4-substituted salicylaldehydes]. The structural and magnetic properties of the polymeric products are determined by single crystal X-ray diffraction and SQUID magnetometry. By fitting magnetic data of these complexes with the Bonner- Fisher 1-D chain model, the magnitudes of their magnetic exchanges are rationalised on the basis of substituent electronic properties and bridging ligand identity. Chapter Three describes two Fe(II) coordination polymers containing pyridineconjugated Schiff base isomer ligands. The isomerism of the two ligands leads to a change from trans to cis coordination in the [FeL2] SBU and thus from a tetrahedral diamond-like 3 D network exhibiting a gradual SCO to a 2 D hard magnet. Furthermore, we have also sythesised another four Cu(II) complexes based on these two ligands. Crystallographic studies reveal their structures ranging from 1 D zigzag chains and 2 D mat while their magnetic properties are transformed from ferro- to ferrimagnetic behavior. Chapter Four focuses on three pyrrole-2-ketone bidentate ligands. Three transition metal ions Mn2+, Fe2+ and Co2+ were studied, based on which twelve complexes have been made. The system is structurally diverse, with 1 D, 2 D, monometallic, trimetallic “sandwich” structures and a high nuclearity cluster being observed depending on the use of cations and solvents. Unusual magnetic phenomena are discovered, including a system in which SCO and ferromagnetic coupling are present. Chapter Five details the experimental procedures used to carry out the work in this thesis.
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Guo, Qing. "Single Molecule Optical Magnetic Tweezers Microscopy Studies of Protein Dynamics." Bowling Green State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1435334948.

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Books on the topic "Magnetic molecule"

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Turnbull, Mark M., Toyonari Sugimoto, and Laurence K. Thompson, eds. Molecule-Based Magnetic Materials. Washington, DC: American Chemical Society, 1996. http://dx.doi.org/10.1021/bk-1996-0644.

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1956-, Turnbull Mark M., Sugimoto Toyonari 1945-, Thompson Laurence K. 1943-, American Chemical Society. Division of Inorganic Chemistry., and International Chemical Congress of Pacific Basin Societies (1995 : Honolulu, Hawaii), eds. Molecule-based magnetic materials: Theory, techniques, and applications. Washington, DC: American Chemical Society, 1996.

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ICMM 2004 (2004 Tsukuba International Congress Center). The IXth International Conference on Molecule-Based Magnets, ICMM 2004: October 4-8, 2004, Tsukuba International Congress Center, Tsukuba, Japan. Japan: s.n., 2004.

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J, Lagowski J., ed. Marvels of the molecule. New York, N.Y: VCH, 1987.

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5

Eckels, Edward Charles. Using single molecule magnetic tweezers to dissect titin energy release during muscle contraction. [New York, N.Y.?]: [publisher not identified], 2019.

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Wang, Jian. The design, synthesis and characterization of new building blocks for the preparation of molecule-based magnetic materials. St. Catharines, Ont: Brock University, Dept. of Chemistry, 2007.

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Koichi, Itoh, and Kinoshita Minoru, eds. Molecular magnetism: New magnetic materials. Tokyo: Kodansha, 2000.

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Jaume, Veciana, and Arčon D, eds. [Pi]-electron magnetism: From molecules to magnetic materials. Berlin: Springer, 2001.

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Molecular magnetism. New York, NY: VCH, 1993.

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W, Linert, and Verdaguer Michel, eds. Molecular magnets: Recent highlights. Wien: Springer, 2003.

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Book chapters on the topic "Magnetic molecule"

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Taran, Gheorghe, Edgar Bonet, and Wolfgang Wernsdorfer. "Single-Molecule Magnets and Molecular Quantum Spintronics." In Handbook of Magnetism and Magnetic Materials, 979–1009. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63210-6_18.

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Yamashita, Masahiro, and Keiichi Katoh. "Single Molecule Magnets." In Molecular Magnetic Materials, 79–101. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527694228.ch4.

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Tangoulis, Vassilis, and Nikolia Lalioti. "Magnetic Modeling of Single-molecule Magnets." In Single-Molecule Magnets, 87–134. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527809929.ch3.

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Pissas, Michael, Vassilis Psycharis, Catherine Raptopoulou, and Yiannis Sanakis. "Unique Magnetic Properties." In Single-Molecule Magnets, 41–86. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527809929.ch2.

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Bianco, Piero R., Yuri L. Lyubchenko, and Zhiqiang Sun. "Magnetic Tweezers." In An Introduction to Single Molecule Biophysics, 115–40. Boca Raton : Taylor & Francis, 2017. | Series: Foundations of biochemistry and biophysics: CRC Press, 2017. http://dx.doi.org/10.1201/b22505-4.

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Misra, Sushil K. "Single-Molecule Magnets and Magnetic Quantum Tunneling." In Multifrequency Electron Paramagnetic Resonance, 845–74. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527633531.ch21.

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Seol, Yeonee, and Keir C. Neuman. "Magnetic Tweezers for Single-Molecule Manipulation." In Single Molecule Analysis, 265–93. Totowa, NJ: Humana Press, 2011. http://dx.doi.org/10.1007/978-1-61779-282-3_15.

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Krzystek, J., and Joshua Telser. "Insight into Magnetic and Electronic Properties Through HFEPR Studies." In Single-Molecule Magnets, 135–72. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527809929.ch4.

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Vilfan, I. D., J. Lipfert, D. A. Koster, S. G. Lemay, and N. H. Dekker. "Magnetic Tweezers for Single-Molecule Experiments." In Handbook of Single-Molecule Biophysics, 371–95. New York, NY: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-76497-9_13.

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Guo, Zilong, and Hu Chen. "Single-Molecule Manipulation by Magnetic Tweezers." In Single-Molecule Tools for Bioanalysis, 173–211. Boca Raton: Jenny Stanford Publishing, 2022. http://dx.doi.org/10.1201/9781003189138-5.

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Conference papers on the topic "Magnetic molecule"

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Tyagi, Pawan, and Christopher D’Angelo. "A Monte Carlo Study of Molecular Spintronics Devices." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62413.

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Molecular spintronics devices (MSDs) are capable of harnessing the controllable transport and magnetic properties of molecular device elements and are highly promising candidates for revolutionizing computer logic and memory. These advanced MSD can enable the next generation of instrumentation and control devices for the wide range of mechanical engineering systems. A MSD is typically produced by placing magnetic molecule(s) between the two ferromagnetic electrodes. Recent experimental studies show that some magnetic molecules produced unprecedented strong exchange couplings between the two ferromagnetic electrodes, leading to intriguing magnetic and transport properties in a MSD. Future development of MSDs will critically depend on obtaining an in-depth understanding of the molecule induced exchange coupling, and its impact on MSD’s switchability, functional temperature range, stability etc. However, the large size of MSD systems and unsuitable device designs are the two biggest hurdles in theoretical and experimental studies of magnetic attributes produced by molecules in a MSD. This research theoretically studies the MSD by performing Monte Carlo simulations (MCS). The effect of magnetic molecule induced exchange coupling was studied at different temperature and for different device sizes — represented by a 2D Ising model. Our MCS shows that thermal energy of the MSD strongly influenced the molecular coupling effect. We studied the effect of a wide range of molecule-metal electrode couplings on the fundamental properties of MSDs. If molecules induced exchange coupling increased beyond a threshold limit a MSD acquired dramatically new attributes. Our MCS exhibited that the transition points in MSD’s magnetic properties was the interplay of temperature and molecular coupling strength. These simulations will allow the understanding of fundamental device mechanisms behind the functioning of novel MSDs. Our MSD model represents a myriad of magnetic molecules and ferromagnets combinations promising for realizing experimental MSDs. These MCS will also assist in designing new class of MSDs with desired attributes for advanced computers and control systems.
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Prins, Menno W. J., Adrian Ionescu, James Anthony, and Charles Bland. "Magnetic Biosensors—From Molecule to System." In BIOMAGNETISM AND MAGNETIC BIOSYSTEMS BASED ON MOLECULAR RECOGNITION PROCESSES. AIP, 2008. http://dx.doi.org/10.1063/1.2956822.

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Barker, Alex J., Brant Cage, Stephen Russek, Ruchira Garg, Robin Shandas, and Conrad R. Stoldt. "Tailored Nanoscale Contrast Agents for Magnetic Resonance Imaging." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81503.

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Two potential molecular imaging vectors are investigated for material properties and magnetic resonance imaging (MRI) contrast improvement. Monodisperse magnetite (Fe3O4) nanocrystals ranging in size from 7 to 22 nm are solvothermally synthesized by thermolysis of Fe(III) acetylacetonate (Fe(AcAc)3) both with and without the use of heptanoic acid (HA) as a capping ligand. For the resulting Fe3O4 nanocrystals, X-Ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and superconducting quantum interference device magnetometry (SQUID) is used to identify the average particle size, monodispersity, crystal symmetry, and magnetic properties of the ensembles as a function of time. The characterization study indicates that the HA synthesis route at 3 hours produced nanoparticles with the greatest magnetic anisotropy (15.8 × 104 J/m3). The feasibility of Fe8 single molecule magnets (SMMs) as a potential MRI contrast agent is also examined. SQUID magnetization measurements are used to determine anisotropy and saturation of the potential agents. The effectiveness of the Fe3O4 nanocrystals and Fe8 as potential MRI molecular probes is evaluated by MRI contrast improvement using 1.5 mL phantoms dispersed in de-ionized water. Results indicate that the magnetically optimized Fe3O4 nanocrystals and Fe8 SMMs hold promise for use as contrast agents based on the reported MRI images and solution phase T1/T2 shortening.
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Brecha, R. J., D. Krause, and L. M. Pedrotti. "Laser Diode Magnetic Rotation Spectroscopy of Oxygen." In Optical Remote Sensing of the Atmosphere. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/orsa.1997.owc.4.

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For many years magnetic rotation spectroscopy (MRS) has been used as a sensitive detection technique for various paramagnetic molecular species. [1], [2] A great deal of emphasis has been on nitrous oxide (NO) as a molecule of interest, for example in studies of atmospheric chemistry [3]. Another common paramagnetic molecule is oxygen, of interest for example in combustion studies. We present here results for wavelength modulated MRS of the so-called atmospheric band of oxygen at λ ~ 760nm using a very compact experimental setup based on a semiconductor diode laser operating near room temperature.
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Tagaya, Yoichi, Yasunaga Mitsuya, Susumu Ogata, Hedong Zhang, and Kenji Fukuzawa. "A Simulation Method for Spreading Dynamics of Molecularly Thin Lubricant Films on Magnetic Disks Using Bead-Spring Model." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64393.

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An effective simulation technique for describing the spreading properties of molecularly thin lubricant films on magnetic disks has been developed. We propose a molecular precipitation method that can simulate initial molecule arrangement of the films dip-coated onto the disks. Reptation and Rouse models as the model of the molecular motion, and molecular insertion and molecular precipitation methods as the method for putting molecules in initial positions were compared. From the results of the spreading profiles and diffusion coefficients, it has been revealed that the molecular precipitation method combined with the Rouse model is effective in simulating the spreading of the lubricant films.
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Rupnik, K., W. S. Felps, and S. P. McGlynn. "VUV electronic absorption and magnetic circular dichroism study of HI molecules." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.wn5.

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We present the results of the first VUV (250–146 nm) magnetic circular dichroism (MCD) study of HI molecule in the gaseous state at various pressures below 1 Torr. MCD spectroscopy1 measures the difference in the absorption of right and left circularly polarized light, and refers to the situation in which a static magnetic field is applied parallel to the direction of the polarized beam. This molecule is of particular interest since it is a simple diatomic that exhibits resolved rotational, vibrational and electronic structure below the CaF2 cutoff of 140 nm. Progress in MCD measurements beyond this limit requires optics not presently available. We are investigating pressure effects and the dependence of spectra on magnetic field strength (1–5 T). The analysis of the absorption spectrum of HI molecule is also important to the proposed models of electron-nuclear momentum coupling. We are also investigating the possible role of spin-orbit mechanisms in the VUV electronic absorption and MCD of HI molecules.
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Dillard, Joshua, Uzma Amir, Pawan Tyagi, and Vincent Lamberti. "Structural Stability of Magnetic Tunnel Junction Based Molecular Spintronics Devices (MTJMSD)." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24134.

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Abstract Harnessing the exotic properties of molecular level nanostructures to produce novel sensors, metamaterials, and futuristic computer devices can be technologically transformative. In addition, connecting the molecular nanostructures to ferromagnetic electrodes bring the unprecedented opportunity of making spin property based molecular devices. We have demonstrated that magnetic tunnel junction based molecular spintronics device (MTJMSD) approach to address numerous technological hurdles that have been inhibiting this field for decades (P. Tyagi, J. Mater. Chem., Vol. 21, 4733). MTJMSD approach is based on producing a capacitor like a testbed where two metal electrodes are separated by an ultrathin insulator and subsequently bridging the molecule nanostructure across the insulator to transform a capacitor into a molecular device. Our prior work showed that MTJMSDs produced extremely intriguing phenomenon such as room temperature current suppression by six orders, spin photovoltaic effect, and evolution of new forms of magnetic metamaterials arising due to the interaction of the magnetic a molecule with two ferromagnetic thin films. However, making robust and reproducible electrical connections with exotic molecules with ferromagnetic electrodes is full of challenges and requires attention to MTJMSD structural stability. This paper focuses on MTJMSD stability by describing the overall fabrication protocol and the associated potential threat to reliability. MTJMSD is based on microfabrication methods such as (a) photolithography for patterning the ferromagnetic electrodes, (b) sputtering of metallic thin films and insulator, and (c) at the end electrochemical process for bridging the molecules between two ferromagnetic films separated by ∼ 2nm insulating gap. For the successful MTJMSD fabrication, the selection of ferromagnetic metal electrodes and thickness was found to be a deterministic factor in designing the photolithography, thin film deposition strategy, and molecular bridging process. We mainly used isotropic NiFe soft magnetic material and anisotropic Cobalt (Co) with significant magnetic hardness. We found Co was susceptible to chemical etching when directly exposed to photoresist developer and aged molecular solution. However, NiFe was very stable against the chemicals we used in the MTJMSD fabrication. As compared to NiFe, the Co films with > 10nm thickness were susceptible to mechanical stress-induced nanoscale deformities. However, cobalt was essential to produce (a) low leakage current before transforming the capacitor from the magnetic tunnel junction into molecular devices and (b) tailoring the magnetic properties of the ferromagnetic electrodes. This paper describes our overall MTJMSD fabrication scheme and process optimization to overcome various challenges to produce stable and reliable MTJMSDs. We also discuss the role of mechanical stresses arising during the sputtering of the ultrathin insulator and how to overcome that challenge by optimizing the insulator growth process. This paper will benefit researchers striving to make nanoscale spintronics devices for solving grand challenges in developing advanced sensors, magnetic metamaterials, and computer devices.
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Hong, Chin-Yih, Shieh-Yueh Yang, Herng-Er Horng, Jen-Jie Chieh, and Hong-Chang Yang. "Universal Behavior for Characteristic Curve of Immunomagnetic Reduction Assay With Aid of Biofunctionalized Magnetic Nanoparticles." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-86436.

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By biofunctionalizing magnetic nanoparticles with bioprobes, magnetic nanoparticles are able to specifically label bio-molecules. With the association between magnetic nanoparticles and bio-molecules, the mixed-frequency AC magnetic susceptibility generated with the physical rotation of individual magnetic nanoparticles under external AC magnetic fields is reduced. This detection technology is so-called immunomagnetic reduction (IMR) assay. In the experiment, several kinds of proteins and small-molecule chemicals were detected via IMR. The characteristic curves, i.e. the reduction versus the concentration of protein/chemical, for these proteins or chemicals can be scaled to one universal curve.
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Du, Jiangfeng. "Spin magnetic resonance spectroscopy from billions of molecules to single molecule (Conference Presentation)." In Advances in Photonics of Quantum Computing, Memory, and Communication XI, edited by Zameer U. Hasan, Philip R. Hemmer, Alan L. Migdall, and Alan E. Craig. SPIE, 2018. http://dx.doi.org/10.1117/12.2298397.

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Ablay, Gunyaz, Mustafa Boyuk, Yakup Eroglu, and Kutay Icoz. "A horizontal magnetic tweezer for single molecule micromanipulations." In 2018 2nd International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT). IEEE, 2018. http://dx.doi.org/10.1109/ismsit.2018.8567067.

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Reports on the topic "Magnetic molecule"

1

Miller, Joel S. SYNTHESIS of MOLECULE/POLYMER-BASED MAGNETIC MATERIALS. Office of Scientific and Technical Information (OSTI), February 2016. http://dx.doi.org/10.2172/1236463.

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Diel, B. N. Design and Construction of Main Group Element-Containing Molecules and Molecule-Derived Materials With Unusual Electronic, Optical, and Magnetic Properties. Office of Scientific and Technical Information (OSTI), August 2004. http://dx.doi.org/10.2172/830008.

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Rousochatzakis, Ioannis. Theoretical Investigation of Dynamic Properties of Magnetic Molecule Systems as Probed by NMR and Pulsed Fields Experiments. Office of Scientific and Technical Information (OSTI), December 2005. http://dx.doi.org/10.2172/861633.

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Fernando, P. U. Ashvin Iresh, Gilbert Kosgei, Matthew Glasscott, Garrett George, Erik Alberts, and Lee Moores. Boronic acid functionalized ferrocene derivatives towards fluoride sensing. Engineer Research and Development Center (U.S.), July 2022. http://dx.doi.org/10.21079/11681/44762.

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In this technical report (TR), a robust, readily synthesized molecule with a ferrocene core appended with one or two boronic acid moieties was designed, synthesized, and used toward F- (free fluoride) detection. Through Lewis acid-base interactions, the boronic acid derivatives are capable of binding with F- in an aqueous solution via ligand exchange reaction and is specific to fluoride ion. Fluoride binding to ferrocene causes significant changes in fluorescence or electrochemical responses that can be monitored with field-portable instrumentation at concentrations below the WHO recommended limit. The F- binding interaction was further monitored via proton nuclear magnetic resonance spectroscopy (1H-NMR). In addition, fluorescent spectroscopy of the boronic acid moiety and electrochemical monitoring of the ferrocene moiety will allow detection and estimation of F- concentration precisely in a solution matrix. The current work shows lower detection limit (LOD) of ~15 μM (285 μg/L) which is below the WHO standards. Preliminary computational calculations showed the boronic acid moieties attached to the ferrocene core interacted with the fluoride ion. Also, the ionization diagrams indicate the amides and the boronic acid groups can be ionized forming strong ionic interactions with fluoride ions in addition to hydrogen bonding interactions.
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Engelhardt, Larry. Quantum Monte Carlo Calculations Applied to Magnetic Molecules. Office of Scientific and Technical Information (OSTI), January 2006. http://dx.doi.org/10.2172/892729.

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Laws, David Douglas. Novel nuclear magnetic resonance techniques for studying biological molecules. Office of Scientific and Technical Information (OSTI), June 2000. http://dx.doi.org/10.2172/970017.

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Topping, Craig V. Molecular Magnets and Reduced Dimensionality. Office of Scientific and Technical Information (OSTI), December 2012. http://dx.doi.org/10.2172/1058056.

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Jarvie, T. P. Molecular structure and motion in zero field magnetic resonance. Office of Scientific and Technical Information (OSTI), October 1989. http://dx.doi.org/10.2172/7040223.

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Christou, George. Molecular Magnetism in North America Conference. Office of Scientific and Technical Information (OSTI), May 2021. http://dx.doi.org/10.2172/1782230.

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Liu, Amy Y., Tunna Baruah, and Kyungwha Park. Prediction of Magnetic and Electronic Phenomena in Molecular-Assembled Crystals. Fort Belvoir, VA: Defense Technical Information Center, December 2008. http://dx.doi.org/10.21236/ada491900.

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