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Gotowa bibliografia na temat „Magnetic Exchange Interaction”

Autor: Grafiati

Data publikacji: 7 września 2023

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Artykuły w czasopismach na temat "Magnetic Exchange Interaction"

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Belokon, Valery I., i Olga I. Dyachenko. "Phase Transitions in Magnets with Competing Exchange Interactions". Solid State Phenomena 215 (kwiecień 2014): 119–22. http://dx.doi.org/10.4028/www.scientific.net/ssp.215.119.

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In this investigations the systems of the nanoparticles with competing exchange interactions are considered. The critical concentrations and possible types of magnetic states of particles in the case of direct exchange and RKKY interaction in the framework of the random interaction field method are determined. It is observed that in magnetic materials with the competition of the direct and indirect exchanges changing the type of ordering is possible at the change in the intensity of the indirect exchange under the influence of external factors.

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Baranava, M. S. "Low-dimensional Magnetism in Compounds with Different Dimensions of Magnetic Interaction". Doklady BGUIR 20, nr 4 (29.06.2022): 62–70. http://dx.doi.org/10.35596/1729-7648-2022-20-4-62-70.

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The results of a comparison of the exchange interaction mechanisms in low dimensional magnetic systems are presented. It has been shown that ZnO crystal may be used as a semiconductor non-magnetic matrix for the formation of quasi-one-dimensional and quasi-zero-dimensional magnetic systems by introducing impurity atoms of Cr, Mn, Fe, Co and Ni. Structural parameters, electronic and magnetic properties were calculated at the atomic level in the framework of quantum mechanical simulation. The exchange interaction integrals were calculated at the microscopic level using the Heisenberg model. The exchange interaction mechanisms were determined on the obtained dependences of the exchange interaction integral on the structural and electronic properties, as well as on the features of the low-dimensional magnetic systems partial density of electronic states. The results of studying the exchange interaction mechanisms in two-dimensional magnetic systems formed in materials of the MAX3 (M= Cr, Fe, A = Ge, Si, X= S, Se, Te) group are summarized. The established mechanisms made it possible to compare the conditions for the formation of a ferromagnetic order in systems with different dimensions of magnetic interaction. The ferromagnetic order in all the structures under study is formed due to the indirect superexchange interaction between orbitals of different symmetry. Strategies aimed at enhancing the superexchange interactions between orbitals of different symmetry or attenuating the contributions of the exchange interaction between orbitals of the same symmetry contribute to the formation of stable hightemperature ferromagnetism.

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Köbler, U., i A. Hoser. "Magnetic Interaction by Exchange of Field Bosons". Acta Physica Polonica A 121, nr 5-6 (maj 2012): 1176–78. http://dx.doi.org/10.12693/aphyspola.121.1176.

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Igarashi, Masukazu, Shun Tonooka, Hiroyuki Katada, Maki Maeda, Miki Hara i Roger Wood. "Exchange interaction energy in magnetic recording simulation". Journal of Applied Physics 117, nr 17 (7.05.2015): 17D127. http://dx.doi.org/10.1063/1.4915352.

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Yu, Shinn-Sheng, i Ven-Chung Lee. "Indirect exchange interaction in diluted magnetic semiconductors". Journal of Physics: Condensed Matter 4, nr 11 (16.03.1992): 2961–75. http://dx.doi.org/10.1088/0953-8984/4/11/021.

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Kimura, Izuru. "Magnetic structure and exchange interaction in DyCu2". Journal of Magnetism and Magnetic Materials 70, nr 1-3 (grudzień 1987): 273–74. http://dx.doi.org/10.1016/0304-8853(87)90436-7.

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Jekal, Eunsung. "External Environment Dependent Spin and Orbital Exchange Interactions". Journal of Modeling and Simulation of Materials 3, nr 1 (29.07.2020): 79–83. http://dx.doi.org/10.21467/jmsm.3.1.79-83.

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We present a set of equations expressing the parameters of the magnetic interactions of an electronic system. This allows to establish a mapping between the initial electronic system and a spin model including up to quadratic interactions between the effective spins, with a general interaction (exchange) tensor that accounts for anisotropic exchange, Dzyaloshinskii–Moriya interaction and other symmetric terms such as dipole–dipole interaction. We present the formulas in a format that can be used for computations via Dynamical Mean Field Theory algorithms.

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Oh, Young-Woo. "Exchange-coupling Interaction and Magnetic Properties of BaFe12O19/Ni0.5Zn0.5Fe2O4Nanocomposite Ferrite". Journal of the Korean Magnetics Society 24, nr 3 (30.06.2014): 81–85. http://dx.doi.org/10.4283/jkms.2014.24.3.081.

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Feng, Peng, i Jianqiao Xie. "Optical resonant RKKY interaction in nanosystems". Canadian Journal of Physics 93, nr 11 (listopad 2015): 1269–73. http://dx.doi.org/10.1139/cjp-2014-0647.

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Conduction electron spins interacting with magnetic impurity spins can lead to an indirect exchange interaction between magnetic impurities in nonmagnetic metals or semiconductors, namely, RKKY interaction. In general, this RKKY coupling is too weak to apply on devices. In this paper, we find that when a laser field of appropriate frequency irradiates the nanosystems, it can greatly strengthen the RKKY interaction. This is the so-called optical resonant RKKY interaction. We give the resonant frequencies for different size samples, and calculate the exchange integrals for these samples on the near-resonant conditions. This optical resonant RKKY coupling may be strong enough to guarantee its application on spintronic devices.

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Nauman, Muhammad, Tayyaba Hussain, Joonyoung Choi, Nara Lee, Young Jai Choi, Woun Kang i Younjung Jo. "Low-field magnetic anisotropy of Sr₂IrO₄". Journal of Physics: Condensed Matter 34, nr 13 (20.01.2022): 135802. http://dx.doi.org/10.1088/1361-648x/ac484d.

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Abstract Magnetic anisotropy in strontium iridate (Sr2IrO4) is essential because of its strong spin–orbit coupling and crystal field effect. In this paper, we present a detailed mapping of the out-of-plane (OOP) magnetic anisotropy in Sr2IrO4 for different sample orientations using torque magnetometry measurements in the low-magnetic-field region before the isospins are completely ordered. Dominant in-plane anisotropy was identified at low fields, confirming the b axis as an easy magnetization axis. Based on the fitting analysis of the strong uniaxial magnetic anisotropy, we observed that the main anisotropic effect arises from a spin–orbit-coupled magnetic exchange interaction affecting the OOP interaction. The effect of interlayer exchange interaction results in additional anisotropic terms owing to the tilting of the isospins. The results are relevant for understanding OOP magnetic anisotropy and provide a new way to analyze the effects of spin–orbit-coupling and interlayer magnetic exchange interactions. This study provides insight into the understanding of bulk magnetic, magnetotransport, and spintronic behavior on Sr2IrO4 for future studies.

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Rozprawy doktorskie na temat "Magnetic Exchange Interaction"

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Inoue, Jun-ichiro. "Effective exchange interaction and Curie temperature in magnetic semiconductors". The American Physical Society, 2003. http://hdl.handle.net/2237/7112.

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Sapozhnik, Alexey [Verfasser]. "Magnetic properties of antiferromagnetic Mn2Au: exchange interaction and domain manipulation / Alexey Sapozhnik". Mainz : Universitätsbibliothek Mainz, 2018. http://d-nb.info/1170263666/34.

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Kalapos, Thomas Lawrence. "Interaction of Water with the Proton Exchange Fuel Cell Membrane". Case Western Reserve University School of Graduate Studies / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=case1175891061.

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Pinel, Lucas. "Probing the magnetic exchange interaction in agraphene-ferromagnetic insulator system usingQuantum Hall Effect and non-local resistancemeasurements". Thesis, KTH, Tillämpad fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-162232.

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Tanaka, Hiroki. "Zeeman Splitting Caused by Localized sp-d Exchange Interaction in Ferromagnetic GaMnAs Observed by Magneto-Optical Characterization". Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1441982108.

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Vallobra, Pierre. "Effects of interfacial interactions on optical switching in magnetic heterostructures". Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0015/document.

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Pendant les 20 dernières années, le nanomagnétisme a suscité un intérêt grandissant au sein de la communauté scientifique du fait de ses nombreuses applications pour les mémoires magnétiques. A l’échelle nanométrique beaucoup de propriétés des matériaux magnétiques découlent de leurs interfaces avec d’autres matériaux (magnétiques ou non). Cela explique l’omniprésence des hétérostructures composées de plusieurs couches d’épaisseur nanométrique dans le domaine du nanomagnétisme. Dans les hétérostructures que nous étudions, ces propriétés interfaciales sont le décalage d’échange, l’interaction Dzyaloshinskii-Moriya, l’anisotropie magnétique perpendiculaire et l’échange entre deux couches ferromagnétiques. D’abord nous étudions la modification du champ de décalage d’échange dans une bicouche [Pt/Co]xN/IrMn lorsque l’on l’expose à des impulsions laser de lumière polarisée circulairement. Nous montrons que le champ de décalage d’échange après exposition au laser résulte de la configuration du ferromagnétique [Pt/Co]xN. Nous étudions ensuite les conditions nécessaires à un retournement tout optique dépendant de l’hélicité d’un matériau ferrimagnétique de synthèse composé de deux couches de CoFeB /Pt /CoFeB et Co couplées antiferromagnétiquement et concluons que les facteurs clés qui gouvernent le renversement de l’aimantation totale sont les températures respectives des deux couches. Nous nous sommes aussi concentrés sur la propagation de parois de domaine de Néel de même chiralité stabilisées par interaction Dzyaloshinskii-Moriya dans des multicouches de [Pt/Co/Ni]N. Nous avons finalement démontré la possibilité de générer des bulles skyrmioniques par le laser femtoseconde
During the last 20 years, nanomagnetism has attracted a growing interest in the scientific community due to its multiple applications for magnetic memories. At the nanometer scale, many of the properties of the magnetic materials arise from their interfaces with other materials (magnetic or non-magnetic). This explains the omnipresence of heterostructures composed of several layers of thicknesses in the range of the nanometer in the field of nanomagnetism. In the heterostructures we study, those interfacial properties are the exchange bias, the Dzyaloshinskii-Moriya interaction, the perpendicular magnetic anisotropy and the interlayer exchange between two ferromagnetic layers. First we study the modification of the exchange bias field in a [Pt/Co]xN/IrMn bilayer when we expose it to laser pulses of a femtosecond circularly polarized light. We demonstrate that the final exchange bias field after laser pulses results from the magnetic configuration of the [Pt/Co]xN multilayer. We then study the conditions required for a helicity-dependent all optical switching of a synthetic ferromagnetic material composed of a CoFeB /Pt /CoFeB and a Co ferromagnetic layers coupled antiferromagnetically and conclude that the key factors that drive the switching of the total magnetization are the Curie temperatures of both layers. We focused also on the field-driven propagation of Néel domain walls of the same chirality stabilized by the Dzyaloshinskii-Moriya interaction in [Pt/Co/Ni]xN multilayers. We finally demonstrated the possibility to generate skyrmionic bubbles with the femtosecond laser

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Goryan, Alexander S. "Nuclear magnetic resonance studies on bentonite in complex mixed systems". Licentiate thesis, Luleå tekniska universitet, Industriell miljö- och processteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18463.

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In this work 23Na MAS NMR was validated as a successful quantitative method for studies of exchanging sodium in bentonites useful, in particular, for studies of ion-exchange kinetics. Na-enriched bentonites equilibrated in a re-circulated process water at iron-oxide pelletizing plants may acquire properties of Ca-bentonites after already 20 minutes of the equilibration time, since >50 % of sodium ions will be exchanged by calcium ions during first minutes of bentonite placed in contact with the process water. It was shown that all sodium activated bentonites used in this study exchange >50% of sodium in Na+/Ca2+ and ca 20 % of sodium in binary Na+/Mg2+ systems with the same bentonite/solution ratio and same concentrations of these ions in aqueous solutions as in the process water at a pelletizing plant. In total, approximately 50 % of the exchangeable sodium in original bentonites was exchanged after equilibrating of bentonites in the process water already after 20 minutes. Experimental Na+/Ca2+ exchange curves for ‘model’ Ca2+(aq) solutions and for process water are very similar as Ca2+ is the dominant constituent in the process water. Since bivalent ions (Ca2+ and Mg2+) that present in the process water readily replace Na+ ions, Na-bentonite transforms into Ca- or Mg- bentonite, which have worse rheological, swelling and, therefore, binding properties. This ion-exchange process can influence the binder performance in the pelletizing process. Taking into account that fluorapatite is one of the components present in a blend of minerals processed, possible interactions between orthophosphate (the principal anionic component of apatites) and bentonites in aqueous suspensions are considered. It was found that sorption of orthophosphate on Ca-montmorillonite follows a different pattern from sorption of orthophosphate on aluminum oxides and kaolinite. While there is a small amount of sorption below pH 7, which may involve inner-sphere complexation and precipitation of AlPO4 to Al-OH edge sites on the montmorillonite crystals, most sorption of orthophosphate occurs at higher pH. Both macroscopic sorption measurements and solid-state 31P MAS NMR suggest that above pH 7 there is precipitation of proton depleted calcium phosphate phases. Based on both 31P chemical shifts and 31P chemical shift anisotropies it was concluded that the principal precipitated phased are most likely ‘brushite-like’ phases. Very short spin-lattice T2(31P) relaxation times (≤100 μs) for the orthophosphate/bentonite systems can possibly be explained by the presence of paramagnetic Fe in bentonites. Since there are insufficient concentrations of soluble Fe species in the supernatant solution that may give rise to the observed effects, it is likely that orthophosphate is precipitated as thin layers on the surfaces of montmorillonite crystals, where phosphorus may interact with Fe atoms present in the crystal lattice. PO4-tetrahedra in sorbed species can be also distorted giving rise to a larger 31P CSA than for pure ‘apatite-like phases’. 29Si MAS and 1H-29Si CP/MAS NMR experiments on bentonite samples also performed in this work provide information about impurities of quartz in bentonites, a level of substitution of aluminum by iron atoms in the structure of montmorillonite and about the degree of hydration of montmorillonite. 29Si NMR experiments on bentonite incubated with waterglass in aqueous suspensions at concentrations of sodium silicates as in the process water demonstrated that one can follow the process of polymerization of waterglass in solutions and also detect sodium silicates polymerized on surfaces of bentonites already after 1 hour of incubation. Polymerized waterglass sorbed on bentonite surfaces may also alter rheological, swelling and, therefore, binding properties of sodium-activated bentonites used in pelletization of iron-oxide ores.

Godkänd; 2012; 20121011 (alegor); LICENTIATSEMINARIUM Ämne: Gränsytors kemi/Chemistry of Interfaces Examinator: Professor Oleg N. Antzutkin, Institutionen för samhällsbyggnad och naturresurser, Luleå tekniska universitet Diskutant: Professor emeritus Willis Forsling, Institutionen för samhällsbyggnad och naturresurser, Luleå tekniska universitet Tid: Onsdag den 5 december 2012 kl 13.00 Plats: C305, Luleå tekniska universitet

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Kumar, Deepak. "Thin film growth by combinatorial epitaxy for electronic and energy applications". Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC255.

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Les oxydes de métaux de transition à structure pérovskite ABO3 présentent des degrés de liberté structurels et électroniques fortement enchevêtrés. On s'attend donc à découvrir des phases et des propriétés exotiques en agissant sur le réseau par le biais de divers stimuli externes. L'ingénierie des contraintes épitaxiales dans les couches minces d'oxydes est un moyen important d'adapter la distorsion du réseau cristallin par l'effet coopératif de Jahn Teller. En utilisant les couches minces actives PrVO3 de Jahn Teller comme système modèle, la corrélation structurelle avec le magnétisme est établie. Nous imposons différentes contraintes de contrainte épitaxiale dans les films minces PrVO3 via différents moyens, tels que, en utilisant divers substrats monocristallins disponibles dans le commerce, l'épaisseur du film, des substrats avec des orientations de surface cristallines différentes, etc. En conséquence, des phases nouvelles et cachées, absentes du composé en vrac, commencent à apparaître. Notamment, la contrainte de compression dans les films de PrVO3 améliore l'interaction de super échanges menant à une augmentation de la température de Neel antiferromagnétique, une forte anisotropie magnétique dans les films minces de PrVO3 cultivés sur des substrats SrTiO3 orientés (001), 110 et 111, sont quelques exemples
Transition-metal oxides with an ABO3 perovskite structure exhibit strongly entangled structural and electronic degrees of freedom and thus, one expects to unveil exotic phases and properties by acting on the lattice through various external stimuli. The epitaxial strain engineering in oxide thin films is an important mean to tailor the crystal lattice distortion through cooperative Jahn Teller effect. Using the Jahn Teller active PrVO3 thin films as a model system, the structural correlation with the magnetism is established. We impose different strength of epitaxial strain in PrVO3 thin films via different means, such as, using various commercially available single crystal substrates, film thickness, substrates with different crystal surface orientations, etcetera. As a result, new and hidden phases that are absent in the bulk compound, begin to appear. Namely, the compressive strain in PrVO3 films enhances the super-exchange interaction leading to an increased antiferromagnetic Neel temperature, a strong magnetic anisotropy in PrVO3 thin films grown on (001)-, (110)- and (111)-oriented SrTiO3 substrates, are few examples

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Smith, Craig David. "Synthesis and properties of novel free radicals with potential as molecular magnetic materials and spin probes". Thesis, Queensland University of Technology, 2002.

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Ma, Xiaozhou. "Synthesis and study of redox-active molecular nanomagnets". Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0128.

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Ce travail de thèse portait sur la synthèse et l'étude de complexes magnétiques redox-actifs comme prototypes pour la conception d'aimants moléculaires à haute température. L'activité redox est assurée par le ligand pontant, qui peut moduler et parfois améliorer significativement les propriétés magnétiques. Après un chapitre d'introduction présentant les derniers développements dans le domaine des matériaux magnétiques moléculaires, un accent particulier est mis sur l'importance d'avoir un fort couplage d'échange magnétique J entre les porteurs de spin. Une étude bibliographique présentant deux approches émergentes pour augmenter J dans les composés polynucléaires est également présentée et discutée. Le chapitre 2 présente les synthèses et caractérisations de complexes dinucléaires [M2(tphz)(tpy)2](PF6)n (M = Co(II) ou Ni(II); n = 4, 3, 2, tphz = tétrapyridophénazine, tpy = terpyridine) construits à partir de ligands pontant (tphz) et bloquant (tpy) fortement coordinants et redox-actifs. Les études approfondies de ces composés montrent que le ligand pontant redox-actif peut être utilisé comme un outil de choix pour promouvoir une délocalisation des spins, de forts couplages magnétiques, ainsi que de la commutabilité. L’analyse des résultats obtenus permet également de mieux comprendre les paramètres clés pour l’élaboration de systèmes fortement couplés magnétiquement. Dans le prolongement de ce travail visant à sélectionner les meilleurs composants pour la conception rationnelle d'aimants moléculaires à haute température, le chapitre 3 décrit une nouvelle série de complexes mononucléaires [Cr(III)(tphz)(tpy)](CF3SO3)n (n = 3, 2, 1). Les complexes mono- et doublement réduits présentent des interactions magnétiques remarquablement fortes entre les ions métalliques et les ligands radicalaires, et pourraient servir d'unités magnétiques intéressantes pour la conception d'aimants de plus hautes nucléarités
The thesis work aims at the synthesis and study of redox-active magnetic molecules as prototypes towards the design of molecule-based magnets with high operating temperature, a prerequisite for technological applications. The redox activity is provided by the bridging ligand, which could tune and sometimes enhance significantly the magnetic properties of the resulting molecular architectures. After an introduction chapter presenting the latest developments in the field of molecule-based magnetic materials, special emphasis is given on the importance of having large magnetic exchange coupling J between the spin carriers to reach high operating temperature. This is supported by a bibliographic study concerning two emerging approach to enhance J values in polynuclear compounds. Chapter 2 presents the syntheses and characterizations of dinuclear M(II) complexes [M2(tphz)(tpy)2](PF6)n (M = Co or Ni; n = 4, 3, 2, tphz = tetrapyridophenazine) built by using strongly complexing, redox-active bridging ligand (tphz), and terpyridine (tpy) as capping ligands. The extensive studies on these compounds show that the redox-active bridging ligand can be used as a tool to promote spin delocalization, high spin complexes and magnetic multi-switchability. Importantly the work reveals the key parameters towards building strongly magnetically coupled systems. As a continuation research of finding the best magnetic components for the rational design of high temperature molecule-based magnets, Chapter 3 describes a new series of [Cr(III)(tphz)(tpy)](CF3SO3)n (n = 3, 2, 1) mononuclear complexes. Both the mono and doubly-reduced complexes show remarkable magnetic interactions between metal center and radical ligands, which could further act as interesting magnetic units for the design of higher nuclearities magnets

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Książki na temat "Magnetic Exchange Interaction"

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Tang, Chiu Chung. The magnetic exchange interactions in chromium chalcogenide spinels. Birmingham: Aston University. Departmentof Electrical Engineering and Applied Physics, 1988.

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Saitoh, E., i K. Ando. Exchange spin current. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198787075.003.0003.

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This chapter introduces the concept of exchange spin current, which derives from rewriting the exchange interaction in magnets and formulating a spin-wave spin current. States of matter can be classified into several types in terms of magnetic properties. In paramagnetic and diamagnetic states, matter has no magnetic order and exhibits zero magnetization in the absence of external magnetic fields. In ferromagnetic states, the permanent magnetic moments of atoms or ions align parallel to a certain direction, and the matter exhibits finite magnetization even in the absence of external magnetic fields. In ferrimagnets, the moments align antiparallel but the cancellation is not perfect and net magnetization appears. This interaction that aligns spins is called the exchange interaction.

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Launay, Jean-Pierre, i Michel Verdaguer. The localized electron: magnetic properties. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198814597.003.0002.

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After preliminaries about electron properties, and definitions in magnetism, one treats the magnetism of mononuclear complexes, in particular spin cross-over, showing the role of cooperativity and the sensitivity to external perturbations. Orbital interactions and exchange interaction are explained in binuclear model systems, using orbital overlap and orthogonality concepts to explain antiferromagnetic or ferromagnetic coupling. The phenomenologically useful Spin Hamiltonian is defined. The concepts are then applied to extended molecular magnetic systems, leading to molecular magnetic materials of various dimensionalities exhibiting bulk ferro- or ferrimagnetism. An illustration is provided by Prussian Blue analogues. Magnetic anisotropy is introduced. It is shown that in some cases, a slow relaxation of magnetization arises and gives rise to appealing single-ion magnets, single-molecule magnets or single-chain magnets, a route to store information at the molecular level.

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Kimura, T. Introduction of spin torques. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198787075.003.0019.

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This chapter discusses the spin-transfer effect, which is described as the transfer of the spin angular momentum between the conduction electrons and the magnetization of the ferromagnet that occurs due to the conservation of the spin angular momentum. L. Berger, who introduced the concept in 1984, considered the exchange interaction between the conduction electron and the localized magnetic moment, and predicted that a magnetic domain wall can be moved by flowing the spin current. The spin-transfer effect was brought into the limelight by the progress in microfabrication techniques and the discovery of the giant magnetoresistance effect in magnetic multilayers. Berger, at the same time, separately studied the spin-transfer torque in a system similar to Slonczewski’s magnetic multilayered system and predicted spontaneous magnetization precession.

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Launay, Jean-Pierre, i Michel Verdaguer. Electrons in Molecules. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198814597.001.0001.

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The book treats in a unified way electronic properties of molecules (magnetic, electrical, photophysical), culminating with the mastering of electrons, i.e. molecular electronics and spintronics and molecular machines. Chapter 1 recalls basic concepts. Chapter 2 describes the magnetic properties due to localized electrons. This includes phenomena such as spin cross-over, exchange interaction from dihydrogen to extended molecular magnetic systems, and magnetic anisotropy with single-molecule magnets. Chapter 3 is devoted to the electrical properties due to moving electrons. One considers first electron transfer in discrete molecular systems, in particular in mixed valence compounds. Then, extended molecular solids, in particular molecular conductors, are described by band theory. Special attention is paid to structural distortions (Peierls instability) and interelectronic repulsions in narrow-band systems. Chapter 4 treats photophysical properties, mainly electron transfer in the excited state and its applications to photodiodes, organic light emitting diodes, photovoltaic cells and water photolysis. Energy transfer is also treated. Photomagnetism (how a photonic excitation modifies magnetic properties) is introduced. Finally, Chapter 5 combines the previous knowledge for three advanced subjects: first molecular electronics in its hybrid form (molecules connected to electrodes acting as wires, diodes, memory elements, field-effect transistors) or in the quantum computation approach. Then, molecular spintronics, using, besides the charge, the spin of the electron. Finally the theme of molecular machines is presented, with the problem of the directionality control of their motion.

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Launay, Jean-Pierre, i Michel Verdaguer. The moving electron: electrical properties. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198814597.003.0003.

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The three basic parameters controlling electron transfer are presented: electronic interaction, structural change and interelectronic repulsion. Then electron transfer in discrete molecular systems is considered, with cases of inter- and intramolecular transfers. The semi-classical (Marcus—Hush) and quantum models are developed, and the properties of mixed valence systems are described. Double exchange in magnetic mixed valence entities is introduced. Biological electron transfer in proteins is briefly presented. The conductivity in extended molecular solids (in particular organic conductors) is tackled starting from band theory, with examples such as KCP, polyacetylene and TTF-TCNQ. It is shown that electron–phonon interaction can change the geometrical structure and alter conductivity through Peierls distortion. Another important effect occurs in narrow-band systems where the interelectronic repulsion plays a leading role, for instance in Mott insulators.

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Suzuki, Y. Spin torque in uniform magnetization. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198787075.003.0020.

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This chapter discusses the effects of a spin current injected into a uniformly magnetized ferromagnetic cell. The junction consists of two ferromagnetic layers separated by a nonmagnetic metal interlayer or insulating barrier layer. With a nonmagnetic metal interlayer, the junction is called a giant magnetoresistive nanopillar, and with an insulating barrier layer a magnetic-tunnel junction. When charge current is passed through this device, the electrons are first spin polarized by the fixed layer and spin-polarized current is then injected into the free layer through the nonmagnetic interlayer. This spin current interacts with the spins in the host material by an exchange interaction and exerts a torque. If the exerted torque is large enough, magnetization in the free layer is reversed or continuous precession is excited.

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Glazov, M. M. Electron & Nuclear Spin Dynamics in Semiconductor Nanostructures. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198807308.001.0001.

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In recent years, the physics community has experienced a revival of interest in spin effects in solid state systems. On one hand, solid state systems, particularly semicon- ductors and semiconductor nanosystems, allow one to perform benchtop studies of quantum and relativistic phenomena. On the other hand, interest is supported by the prospects of realizing spin-based electronics where the electron or nuclear spins can play a role of quantum or classical information carriers. This book aims at rather detailed presentation of multifaceted physics of interacting electron and nuclear spins in semiconductors and, particularly, in semiconductor-based low-dimensional structures. The hyperfine interaction of the charge carrier and nuclear spins increases in nanosystems compared with bulk materials due to localization of electrons and holes and results in the spin exchange between these two systems. It gives rise to beautiful and complex physics occurring in the manybody and nonlinear system of electrons and nuclei in semiconductor nanosystems. As a result, an understanding of the intertwined spin systems of electrons and nuclei is crucial for in-depth studying and control of spin phenomena in semiconductors. The book addresses a number of the most prominent effects taking place in semiconductor nanosystems including hyperfine interaction, nuclear magnetic resonance, dynamical nuclear polarization, spin-Faraday and -Kerr effects, processes of electron spin decoherence and relaxation, effects of electron spin precession mode-locking and frequency focusing, as well as fluctuations of electron and nuclear spins.

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Eriksson, Olle, Anders Bergman, Lars Bergqvist i Johan Hellsvik. Aspects of the Solid State. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198788669.003.0002.

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Symmetries play an important role in the theory of the solid state. As will be developed in this Chapter, DFT calculations for crystalline materials are commonly performed for the irreducible part of the first Brillouin zone, an approach which relies on the use of translational and point group symmetries. Two central properties that result from a calculation in reciprocal space are the wave vector resolved energy spectra, the so called band structure, and the energy resolved density of states. For magnetic materials, atomic magnetic moment moments can be defined and calculated, as well as effective inter-atomic exchange interactions.

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Cao, Gang, i Lance DeLong. Physics of Spin-Orbit-Coupled Oxides. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780199602025.001.0001.

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Prior to 2010, most research on the physics and chemistry of transition metal oxides was dominated by compounds of the 3d-transition elements such as Cr, Mn, Fe, Co, Ni, and Cu. These materials exhibited novel, important phenomena that include giant magnetoresistance in manganites, as well as high-temperature superconductivity in doped La₂CuO₄ and related cuprates. The discovery in 1994 of an exotic superconducting state in Sr₂RuO₄ shifted some interest toward ruthenates. Moreover, the realization in 2008 that a novel variant of the classic Mott metal-insulator transition was at play in Sr₂IrO₄ provided the impetus for a burgeoning group of studies of the influence of strong spin-orbit interactions in “heavy” (4d- and 5d-) transition-element oxides. This book reviews recent experimental and theoretical evidence that the physical and structural properties of 4d- and 5d-oxides are decisively influenced by strong spin-orbit interactions that compete or collaborate with comparable Coulomb, magnetic exchange, and crystalline electric field interactions. The combined effect leads to unusual ground states and magnetic frustration that are unique to this class of materials. Novel couplings between the orbital/lattice and spin degrees of freedom, which lead to unusual types of magnetic order and other exotic phenomena, challenge current theoretical models. Of particular interest are recent investigations of iridates and ruthenates focusing on strong spin-orbit interactions that couple the lattice and spin degrees of freedom.

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Części książek na temat "Magnetic Exchange Interaction"

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Sigov, Alexander S. "Frustrations of Exchange Interaction". W Multilayer Magnetic Nanostructures, 19–24. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6246-2_2.

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Hernando, A. "Exchange Interaction in Multiphase Systems". W Magnetic Hysteresis in Novel Magnetic Materials, 609–18. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5478-9_65.

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Blundell, Stephen J. "Concepts in Magnetism". W Springer Proceedings in Physics, 39–62. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64623-3_2.

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AbstractI review some general concepts in magnetism including the nature of magnetic exchange (direct, indirect and superexchange), and how exchange interactions play out in multiple spin systems. The nature of atomic orbitals and the way in which they interact with the spin system is also considered. Several examples are also treated, including the Jahn–Teller interaction and its role in the properties in layered manganites.

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Merkulov, I. A., i A. V. Rodina. "Exchange Interaction Between Carriers and Magnetic Ions in Quantum Size Heterostructures". W Introduction to the Physics of Diluted Magnetic Semiconductors, 65–101. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15856-8_3.

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Zhang, L. X., D. V. Melnikov i J. P. Leburton. "Exchange Interaction and Stability Diagram of Coupled Quantum Dots in Magnetic Fields". W Physical Models for Quantum Dots, 275–88. New York: Jenny Stanford Publishing, 2021. http://dx.doi.org/10.1201/9781003148494-16.

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Skomski, Ralph. "Magnetic Exchange Interactions". W Handbook of Magnetism and Magnetic Materials, 1–50. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63101-7_2-1.

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Skomski, Ralph. "Magnetic Exchange Interactions". W Handbook of Magnetism and Magnetic Materials, 53–102. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63210-6_2.

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Liu, L. M., W. Chen, M. G. Zhu, L. Y. Nie, A. J. Li i J. J. Hu. "Exchange-Coupling Interaction and Effective Anisotropy in Two-Phase Nanocomposite Permanent Magnetic Materials". W Materials Science Forum, 2173–76. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-960-1.2173.

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du Trémolet de Lacheisserie, É., D. Gignoux i M. Schlenker. "Exchange Interactions". W Magnetism, 311–20. New York, NY: Springer New York, 2002. http://dx.doi.org/10.1007/978-0-387-23062-7_9.

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Michelini, F., N. Nègre, G. Fishman, M. Goiran, J. Sadowski, E. Vanelle i S. Askénasy. "sp-d exchange interaction in GaMnAs investigated by resonant Kerr effect under high magnetic field". W Springer Proceedings in Physics, 238–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59484-7_107.

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Streszczenia konferencji na temat "Magnetic Exchange Interaction"

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Savchuk, A., M. Gavaleshko i A. Lyakbovich. "Magnetooptical effects induced by exchange interaction In diluted magnetic semiconductors". W 1993 Digests of International Magnetics Conference. IEEE, 1993. http://dx.doi.org/10.1109/intmag.1993.642465.

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Fukunaga, H., J. Kuma i Y. Kanai. "Effect of strength of intergrain exchange interaction on magnetic properties of nanocomposite magnets". W IEEE International Magnetics Conference. IEEE, 1999. http://dx.doi.org/10.1109/intmag.1999.837703.

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Matsumura, Takeshi, i Akira Ochiai. "Orbital Dependent Magnetic Exchange Interaction in CeXc (Xc = S, Se, Te)". W Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019). Journal of the Physical Society of Japan, 2020. http://dx.doi.org/10.7566/jpscp.30.011154.

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Tsai, M. S., P. H. Lin, C. W. Shih, M. J. Lee, C. W. Huang, N. Y. Jih, D. H. Wei i B. Y. Wang. "Effects of Interfacial Exchange Interaction on the Antiferromagnet-Induced Perpendicular Magnetic Anisotropy". W 2016 International Conference of Asian Union of Magnetics Societies (ICAUMS). IEEE, 2016. http://dx.doi.org/10.1109/icaums.2016.8479686.

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Zhang, L. X., D. V. Melnikov i J. P. Leburton. "Stability diagram and exchange interaction in coupled quantum dots in magnetic fields". W Defense and Security Symposium, redaktorzy Eric J. Donkor, Andrew R. Pirich i Howard E. Brandt. SPIE, 2006. http://dx.doi.org/10.1117/12.666043.

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Nakamura, Takeshi, i Takayuki Ishida. "Magnetic exchange interaction in gadolinium(III) complex having aliphatic nitroxide radical TEMPO". W PROGRESS IN APPLIED MATHEMATICS IN SCIENCE AND ENGINEERING PROCEEDINGS. AIP Publishing LLC, 2016. http://dx.doi.org/10.1063/1.4941215.

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Shvachko, Y., D. Starichenko, A. Korolev, V. Ustinov, D. Boukhvalov, V. Irkhin, O. Khudina i in. "Magnetic Properties of Ni(II) Complexes of (hydrazone)imine 1,2,3-triketones: Intramolecular Exchange Interaction". W 3rd France-Russia Seminar. Les Ulis, France: EDP Sciences, 2007. http://dx.doi.org/10.1051/names2007036.

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Yang, Tzuen Rong, i MiRa Kim. "Exchange interaction of 3D transition metal impurity with band electrons in diluted magnetic semiconductors". W Photonics Taiwan, redaktorzy Yan-Kuin Su i Pallab Bhattacharya. SPIE, 2000. http://dx.doi.org/10.1117/12.392110.

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Sénès ast, M. "Exciton Spin Manipulation In InAs/GaAs Quantum Dots: Exchange Interaction And Magnetic Field Effects". W PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors - ICPS-27. AIP, 2005. http://dx.doi.org/10.1063/1.1994618.

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AHMED, M. A., I. S. AHMED FARAG i NABILAH M. HELMY. "MAGNETIC SUPER-EXCHANGE INTERACTION AND STRUCTURE OF COPPER(II) 1, 4 BUTYLENEDIAMINE TETRACHLORIDE [NH3(CH2)4H3N]CuCl4 SINGLE CRYSTAL". W Proceedings of the Third International Conference on Modern Trends in Physics Research. WORLD SCIENTIFIC, 2011. http://dx.doi.org/10.1142/9789814317511_0007.

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Raporty organizacyjne na temat "Magnetic Exchange Interaction"

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Fernando, P. U. Ashvin Iresh, Gilbert Kosgei, Matthew Glasscott, Garrett George, Erik Alberts i Lee Moores. Boronic acid functionalized ferrocene derivatives towards fluoride sensing. Engineer Research and Development Center (U.S.), lipiec 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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Roy, Beas. Low-temperature nuclear magnetic resonance investigation of systems frustrated by competing exchange interactions. Office of Scientific and Technical Information (OSTI), grudzień 2014. http://dx.doi.org/10.2172/1227288.

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