Bibliographies thématiques / Magnetic Anisotrophy Enhancement

Littérature scientifique sur le sujet « Magnetic Anisotrophy Enhancement »

Auteur : Grafiati
Publié le 7 septembre 2023

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Articles de revues sur le sujet "Magnetic Anisotrophy Enhancement"

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Yuan, Xiao, P. S. Riseborough, Eleonir Calegari et Sergio Magalhaes. « Enhanced Spin Orbit Interaction in Actinides ». Journal of Physics : Conference Series 2164, no 1 (1 mars 2022) : 012059. http://dx.doi.org/10.1088/1742-6596/2164/1/012059.

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Abstract We investigate the effect of many-body interactions on the spin-orbit coupling of anisotropic metals. We use the Underscreened Anderson Lattice Model that was proposed to describe actinide compounds. The Coulomb interactions induce off-diagonal correlations that enhance the components of the spin-orbit coupling. Modest values of the Coulomb interaction U can significantly enhance the spin-orbit coupling and effect the electronic spectrum. The enhancements are most pronounced for systems that are on the verge of magnetic instabilities. The enhancement is anisotropic in crystals with non-cubic symmetries and can lead to giant magnetic anisotropies in paramagnetic states.
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Wu, J. X., X. T. Zhao, W. Liu, Y. Li, J. Ma, Y. H. Song, L. Liu, H. Z. Ju et Z. D. Zhang. « Magnetic properties and coercivity mechanism of high Ce-content CeNdFeB film with Tb diffusion ». Journal of Applied Physics 131, no 16 (28 avril 2022) : 163901. http://dx.doi.org/10.1063/5.0088463.

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Magnetic properties and coercivity mechanism of an anisotropic Ce–Nd–Fe–B film with a high Ce content (70 at. % Nd is replaced by Ce) have been investigated. After grain boundary diffusion with Tb layers, an enhancement of coercivity from 4150 to 9250 Oe is observed. Combining the initial magnetization curves, micromagnetic theory, and in-siut observation of magnetic domains in the demagnetization process, it is confirmed that the coercivity mechanism for the high-Ce-content magnets is the mixed type dominated by the pinning mechanism. Moreover, as the thickness of the Tb diffusion layer increases, the pinning center of domain walls changes from narrow planar inhomogeneities to wide planar inhomogeneities. A growing role of pinning plays in determining the coercivity of samples with increasing the thickness of Tb layer due to the increase in magnetocrystalline anisotropy after Tb substitution in the RE2Fe14B phase. In addition, the CeFe2 intergranular phase leads to the enhancement of coercivity due to decoupling the hard magnetic phase grains. Our results provide an insight into the coercivity mechanism of high-Ce-concentration Ce–Nd–Fe–B magnetic materials and promote the comprehension of the effect of Tb diffusion in the magnetization reversal process.
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Bartolomé, Juan, F. Luis, L. M. García, F. Bartolomé, F. Petroff, C. Deranlot, F. Wilhelm, A. Rogalev, P. Bencok et N. B. Brookes. « Anisotropy Enhancement in Co Granular Multilayers by Capping ». Materials Science Forum 570 (février 2008) : 1–9. http://dx.doi.org/10.4028/www.scientific.net/msf.570.1.

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The effect of capping with Cu, Au and Pt of an array of Co nanoparticles is revised. The magnetic surface anisotropy KS was found to be the dominant contribution to the effective anisotropy Keff of the particles. Recent X-ray Magnetic Circular Dichroism (XMCD) measurements show that there is hybridization between the 3d Co electrons and the d and 4p electrons of the capping metal. By comparison to the mechanisms which give rise to the surface anisotropy in thin films, it is argued that this hybridization governs the modification of KS, and hence, of Keff.
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BARONIA, A., et M. S. TIWARI. « Kinetic Alfvén waves in an inhomogeneous anisotropic magnetoplasma in the presence of an inhomogeneous electric field : particle aspect analysis ». Journal of Plasma Physics 63, no 4 (mai 2000) : 311–28. http://dx.doi.org/10.1017/s0022377899008272.

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Kinetic Alfvén waves in the presence of an inhomogeneous electric field applied perpendicular to the ambient magnetic field in an anisotropic, inhomogeneous magnetoplasma are investigated. The particle aspect approach is adopted to investigate the trajectories of charged particles in the electromagnetic field of a kinetic Alfvén wave. Expressions are found for the field-aligned current, the perpendicular current, the dispersion relation and the particle energies. The growth rate of the wave is obtained by an energy- conservation method. It is predicted that plasma density inhomogeneity is the main source of instability, and an enhancement of the growth rate by electric field inhomogeneity and temperature anisotropy is found. The dispersion relation and growth rate involve the finite-Larmor-radius effect, electron inertia and the temperature anisotropy of the magnetoplasma. The applicability of the investigation to the auroral acceleration region is discussed.
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Anyfantis, Dimitrios I., Camillo Ballani, Nikos Kanistras, Alexandros Barnasas, Vassilios Kapaklis, Georg Schmidt, Evangelos Th Papaioannou et Panagiotis Poulopoulos. « Growth, Magnetic Anisotropies and Exchange Bias of Thin Ni0.95Fe0.05/NiFeO Multilayers ». Coatings 12, no 5 (4 mai 2022) : 627. http://dx.doi.org/10.3390/coatings12050627.

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Ni0.95Fe0.05/NiFeO multilayers were fabricated by radio frequency magnetron sputtering and natural oxidation. Doping of Ni by only 5 at. % Fe results in enhanced layering quality as X-ray reflectivity reveals. Due to magnetostatic anisotropy, the multilayers were found to be in-plane magnetized. The influence of mild thermal annealing (T = 525 K) on the magnetic properties of NiFe/NiFeO multilayers is also investigated. Annealing results in the enhancement of perpendicular magnetic anisotropy, mainly due to an increase in the uniaxial volume anisotropy term. Temperature-dependent hysteresis measurements between 4–400 K revealed considerable enhancement of coercivity and appearance of exchange bias effect.
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Komogortsev, S. V., N. A. Chizhik, E. Y. Filatov, S. V. Korenev, Y. V. Shubin, D. A. Velikanov, Rauf S. Iskhakov et G. Y. Yurkin. « Magnetic Properties and L10 Phase Formation in CoPt Nanoparticles ». Solid State Phenomena 190 (juin 2012) : 159–62. http://dx.doi.org/10.4028/www.scientific.net/ssp.190.159.

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The effect of the atomic disorderorder transformation on remanence, coercivity and magnetic anisotropy energy in CoPt nanoparticles prepared by thermal decomposition and annealed at 400°C for 4 and 16 hours has been studied. The observed remanence and magnetic anisotropy energy enhancement versus annealing time are discussed in the terms of ordering domain formation inside nanoparticles.
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Wang, Xujie, Zhenlong Dou, Chi Zhang, FangFang Deng, XiaoLin Lu, ShuangShuang Wang, Li Zhou et Tao Ding. « Polarization-controlled anisotropy in hybrid plasmonic nanoparticles ». Nanophotonics 11, no 5 (27 janvier 2022) : 1003–9. http://dx.doi.org/10.1515/nanoph-2021-0691.

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Abstract Anisotropy has played a critical role in many material systems, but its controllable creation and modulation have been a long-lasting challenge for the scientific communities. Polarization-addressed anisotropy appears more attractive among all approaches due to its excellent controllability, simplicity, and accuracy, but only a limited number of material systems are applicable for such a concept, which are largely focused on oriented growth. Here, we establish a polarization-dependent anisotropic etching system made of Au@oligomer core–shell nanoparticles (NPs). As the oligomer coatings can be photochemically degraded via two-photon photolithography, the plasmonic near-field enhancement supported by the Au NP cores renders much faster degradation of the oligomer shells along the polarization, resulting in anisotropic Au@oligomer hybrid NPs. Such shape anisotropy leads to polarization-dependent photoluminescence with embedded dyes of methylene blue, which can be used as single-particle-based polarization detector. The oligomer lobes capped at the sides of the Au NP can also function as a protection agent for anisotropic photochemical growth of Au NPs, which evolve into Au nanorods and mushrooms with controlled irradiation time. Such polarization-directed etching of oligomer shells has unique advantages of high local-selectivity, controllability, and versatility for on-chip nanofabrication, which opens many new opportunities for integrated nanophotonic devices.
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Zhang, Jianmin, Baishun Yang, Huiling Zheng, Xiufeng Han et Yu Yan. « Large magnetic anisotropy and strain induced enhancement of magnetic anisotropy in monolayer TaTe2 ». Physical Chemistry Chemical Physics 19, no 35 (2017) : 24341–47. http://dx.doi.org/10.1039/c7cp04445c.

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Aras, Mehmet, Sümeyra Güler-Kılıç et Çetin Kılıç. « Enhancement of the magnetic anisotropy in single semiconductor nanowires via surface doping and adatom deposition ». Nanotechnology 33, no 20 (21 février 2022) : 205202. http://dx.doi.org/10.1088/1361-6528/ac50f0.

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Abstract The magnetic anisotropy of single semiconductor (ZnO and GaN) nanowires incorporating both a transition metal (Co and Mn, respectively) as a substitutional surface dopant and a heavy metal (Au, Bi, or Pt) adatom is studied by performing density-functional supercell calculations with the Hubbard U correction. It is found that a substantial enhancement in the magnetic anisotropy energy is obtained through the deposition of Bi; the deposition of Au and Pt leads to significant variation in other magnetic properties, but not in the magnetic anisotropy energy. An analysis within a band description shows that the coexistence of Bi adatom and a surface dopant with large spin moment activates a mechanism involving reorientation and readjustment of the spin moments of electrons in occupied bands in response to the change of magnetization direction, which promotes giant magnetic anisotropy. Our results for adsorption energetics indicate that the accommodation of Bi in the neighborhood of the surface dopant is more likely in GaN nanowires, because the Bi adatom does (not) tend to be closer to the Mn (Co) dopant on the surface of GaN (ZnO) nanowire. The stability of GaN nanowire with giant magnetic anisotropy owing to the incorporation of both Mn and Bi is demonstrated by performing ab initio molecular dynamics simulations at temperatures considerably higher than room temperature. These results suggest that adatom deposition and surface doping can be used complementarily to develop single nanowire-based spintronic devices.
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Shern, C. S., C. W. Su, Y. E. Wu et S. H. Chen. « Ag induced enhancement of perpendicular magnetic anisotropy ». Surface Science 495, no 3 (décembre 2001) : L821—L826. http://dx.doi.org/10.1016/s0039-6028(01)01610-7.

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Thèses sur le sujet "Magnetic Anisotrophy Enhancement"

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Vojáček, Libor. « Teoretická studie magnetické anizotropie v magnetických tunelových spojích na bázi MgO ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443253.

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Magnetický tunelový spoj (MTJ) je spintronická součástka komerčně používaná ve vysoce citlivých čtecích hlavách pevných disků. Počínaje rokem 2007 přispěla k udržení exponenciálního nárůstu hustoty magnetického zápisu. Kromě toho se také stala stavebním kamenem rychlé, odolné, úsporné a nevolatilní magnetické paměti s přímým přístupem (MRAM). Tento nový typ polovodičové paměti, stejně jako je tomu u čtecích hlav disků, využívá tunelové spoje založené na krystalickém oxidu hořečnatém (MgO) spolu s 3d kovovými magnetickými prvky (Fe a Co). Pro zmenšení MTJ a současné udržení dlouhodobé stability paměti proti tepelným fluktuacím je zapotřebí silná magnetická anizotropie ve směru kolmém na rozhraní kov|MgO. V této práci proto nejdříve provedeme analýzu magnetokrystalické anizotropie (MCA) kubického prostorově centrovaného Fe, Co a Ni na MgO pomocí ab initio simulací. Dále bude vyvinut program pro výpočet tvarové anizotropie, která je kromě MCA velmi podstatná, neboť v součtu dávají efektivní anizotropii. Na závěr implementujeme program pro výpočet MCA na základě poruchové teorie druhého řádu. To nám umožní dát pozorované anizotropní vlastnosti do souvislosti přímo s elektronickou strukturou systému (pásovou strukturou a hustotou stavů).
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Teggart, Brian Joseph. « Fabrication, characterisation and magneto-optical enhancement of thin film BiGa : Dy iron garnet ». Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287432.

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Marcó, García Núria. « Development of resolution-enhanced NMR techniques for improved small-molecules structural analysis ». Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/643305.

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La presente tesis doctoral se centra en el estudio de técnicas de mejora de resolución de la espectroscopía por Resonancia Magnética Nuclear (RMN) para una más simple y precisa elucidación estructural de moléculas pequeñas. El trabajo se ha presentado como un compendio de siete publicaciones escritas para diversas prestigiosas revistas científicas. Las publicaciones desarrollan en profundidad la aplicación de las mejoras de resolución para i) una medida precisa y eficiente de las constantes de acoplamiento tanto homo- como heteronucleares e ii) la optimización de las medidas de parámetros anisotrópicos a través de medios débilmente alineados. Estos dos tópicos se desarrollan mediante: 1. La aplicación de modernas técnicas de RMN para la mejora de laresolución, tanto digital como de señal, en experimentos 2D sin comprometer el tiempo experimental. 2. El diseño de nuevas secuencias de pulsos para la medida de conectividades de largo alcance heteronuclear. 3. La implementación de secuencias de pulsos ya existentes y el diseño de nuevas para el estudio de muestra en medio aniostrópicos. 4. El estudio de nuevos métodos en RMN para la discriminación mediante parámetros anisotrópicos. 5. La aplicación de protocolos para la automatización y simplificación de las medidas de contantes de acomplamientos en medio isotrópicos y anisotrópicos.
The present doctoral thesis is focused on the study of resolution-enhanced techniques for Nuclear Magnetic Resonance (NMR) spectroscopy in order to achieve a simpler and more precise structural elucidation of small molecules. The work has been presented as a compendium of seven publications written in several prestigious scientific journals. The publications develop in depth the application of resolution improvements for i) a precise and efficient measurement of homo- and heteronuclear coupling constants and ii) an optimization of anisotropic parameter measurements through weakly aligned means. These two topics are developed by: 1. The practical implementation of modern NMR techniques to improve the digital and signal resolution of 2D experiments without compromising the experimental time. 2. The design of improved pulse sequences to achieve the measurement of longer- range heteronuclear connectivities. 3. Implementation of novel NMR approaches to study samples in anisotropic environments, as well as the design of new pulse sequences adapted to the experimental measurement of NMR parameters in these media. 4. Evaluation of new NMR strategies for efficient structure discrimination using anisotropic NMR parameters. 5. Application of protocols for the easy automatization and measurement of coupling constants in isotropic and anisotropic media.
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Ho, Jzu-Wei, et 何子維. « Giant enhancement of magneto-optical response and increase in perpendicular magnetic anisotropy of ultrathin Co / Pt (111) films upon thermal annealing ». Thesis, 2000. http://ndltd.ncl.edu.tw/handle/72050110233923629155.

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碩士
國立臺灣大學
物理學研究所
88
The annealing effects on the magnetic properties, crystallographic structure, and the alloy formation, were studied for Co/Pt (111) ultrathin films at coverages up to 5.8 ML, using in situ magneto-optical Kerr effect, low energy electron diffraction, and Auger electron spectroscopy. After the postdeposition annealing in the temperature range of 500 K-800 K,a significant increase in perpendicular magnetic anisotropy at high coverages and a highly enhanced magneto-optical Kerr response with the value about 200%-300% of that before annealing for all coverages investigated are observed. Both findings are shown to be correlated to the formation of a kind of Co-Pt interface(surface) alloy. The 2.2 ML Co/Pt (111) thin film annealed up to 790 K becomes reversible after being cooled down to 325 K in this temperature range. This finding indicates that the 2.2 ML Co/Pt should, from the magnetic point of view, reach another metastable state. The giant enhancement in the perpendicular magneto-optical Kerr signal is expected to be mainly attributed to the transfer of strong spin-orbit coupling of the Pt into the Co magnetic orbit due to the hybridization during interface alloy formation.
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Chapitres de livres sur le sujet "Magnetic Anisotrophy Enhancement"

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Yang, G. Z., P. Burger, D. N. Firmin et S. R. Underwood. « Structure adaptive anisotropic filtering for magnetic resonance image enhancement ». Dans Computer Analysis of Images and Patterns, 384–91. Berlin, Heidelberg : Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/3-540-60268-2_320.

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KASIUK, J., J. PRZEWOŹNIK, J. ŻUKROWSKI et CZ KAPUSTA. « ENHANCEMENT OF MAGNETIC PERPENDICULAR ANISOTROPY IN NANOGRANULAR FeCoZr-CaF2 FILMS BY ION IRRADIATION ». Dans Physics, Chemistry and Applications of Nanostructures, 136–39. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814696524_0035.

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Actes de conférences sur le sujet "Magnetic Anisotrophy Enhancement"

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Wani, Zamir, Amit K. Singh et Shiban K. Koul. « Anisotropic Magnetic Media for Antenna Gain Enhancement ». Dans 2021 IEEE Indian Conference on Antennas and Propagation (InCAP). IEEE, 2021. http://dx.doi.org/10.1109/incap52216.2021.9726262.

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Su, Junwei, Xiao Liu, Majid Charmchi et Hongwei Sun. « Anisotropic Thermal Conductivity Enhancement in Magnetically Aligned Polydimethylsiloxane/Nickel Composite ». Dans ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52693.

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The need for enhancing the thermal conductivity of Polydimethylsiloxane (PDMS) is increasing in applications such as microfluidics, flexible electronics, and biomedical devices. In this research, PDMS/Ni composites with embedded Nickel (Ni) particle columns, aligned under a static magnetic field, were studied for thermal conductivity enhancement. The volume fraction of Ni particles ranged from 2 to 20% but the strength of the applied magnetic field was fixed at 0.45 Tesla. The distribution and morphology of the column structures were quantitatively analyzed using optical microscopy (OM), scanning electron microcopy (SEM) and digital image processing. A reusable 3ω measurement technique was applied to measure the effective thermal conductivity of PDMS/Ni composites in the parallel direction to the magnetic field. Under a static magnetic field, Ni particles align parallel to the field forming columns. The results illustrated that the diameter of Ni columns increased with increasing particle volume fraction while the center-to-center spacing between columns did not change substantially under the fixed magnetic strength. The magnetically aligned particle columns significantly enhanced the thermal conductivity of PDMS compared to the randomly distributed particles by about two fold.
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Shen, W., A. Das, M. Racine, R. Cheng, J. H. Judy et J. Wang. « Magnetic Anisotropy Enhancement for hcp Structured Co Alloy Thin Films through Pt Doping ». Dans INTERMAG 2006 - IEEE International Magnetics Conference. IEEE, 2006. http://dx.doi.org/10.1109/intmag.2006.375671.

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Thakur, Jyoti, Priti Rani, Monika Tomar, Vinay Gupta et Manish K. Kashyap. « Enhancement of magnetic anisotropy of Fe5PB2 with W substitution : ab-initio study ». Dans PROCEEDINGS OF THE NATIONAL CONFERENCE ON RECENT ADVANCES IN CONDENSED MATTER PHYSICS : RACMP-2018. Author(s), 2019. http://dx.doi.org/10.1063/1.5097081.

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Ohnuma, M., H. Ohtsuka, H. Fujimori et K. Hono. « Mechanism of induced magnetic anisotropy in metal-nonmetal granular films and their enhancement by a high field annealing ». Dans INTERMAG Asia 2005 : Digest of the IEEE International Magnetics Conference. IEEE, 2005. http://dx.doi.org/10.1109/intmag.2005.1463691.

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Nikolaeva, Albina A., Leonid A. Konopko, Tito E. Huber, Anna K. Tsurkan et Oxana V. Botnari. « Enhancement of thermopower anisotropy in Bi and Bi-Sn wires under elastic deformation and magnetic field ». Dans 9TH EUROPEAN CONFERENCE ON THERMOELECTRICS : ECT2011. AIP, 2012. http://dx.doi.org/10.1063/1.4731554.

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Park, Jeong-Heon, Y. Kim, W. C. Lim, J. H. Kim, S. H. Park, J. H. Kim, W. Kim et al. « Enhancement of data retention and write current scaling for sub-20nm STT-MRAM by utilizing dual interfaces for perpendicular magnetic anisotropy ». Dans 2012 IEEE Symposium on VLSI Technology. IEEE, 2012. http://dx.doi.org/10.1109/vlsit.2012.6242459.

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