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Articles de revues sur le sujet « Magnetic Exchange Interaction »

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Auteur : Grafiati
Publié le 7 septembre 2023

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1

Belokon, Valery I., et Olga I. Dyachenko. « Phase Transitions in Magnets with Competing Exchange Interactions ». Solid State Phenomena 215 (avril 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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2

Baranava, M. S. « Low-dimensional Magnetism in Compounds with Different Dimensions of Magnetic Interaction ». Doklady BGUIR 20, no 4 (29 juin 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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3

Köbler, U., et A. Hoser. « Magnetic Interaction by Exchange of Field Bosons ». Acta Physica Polonica A 121, no 5-6 (mai 2012) : 1176–78. http://dx.doi.org/10.12693/aphyspola.121.1176.

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4

Igarashi, Masukazu, Shun Tonooka, Hiroyuki Katada, Maki Maeda, Miki Hara et Roger Wood. « Exchange interaction energy in magnetic recording simulation ». Journal of Applied Physics 117, no 17 (7 mai 2015) : 17D127. http://dx.doi.org/10.1063/1.4915352.

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5

Yu, Shinn-Sheng, et Ven-Chung Lee. « Indirect exchange interaction in diluted magnetic semiconductors ». Journal of Physics : Condensed Matter 4, no 11 (16 mars 1992) : 2961–75. http://dx.doi.org/10.1088/0953-8984/4/11/021.

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6

Kimura, Izuru. « Magnetic structure and exchange interaction in DyCu2 ». Journal of Magnetism and Magnetic Materials 70, no 1-3 (décembre 1987) : 273–74. http://dx.doi.org/10.1016/0304-8853(87)90436-7.

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7

Jekal, Eunsung. « External Environment Dependent Spin and Orbital Exchange Interactions ». Journal of Modeling and Simulation of Materials 3, no 1 (29 juillet 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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8

Oh, Young-Woo. « Exchange-coupling Interaction and Magnetic Properties of BaFe12O19/Ni0.5Zn0.5Fe2O4Nanocomposite Ferrite ». Journal of the Korean Magnetics Society 24, no 3 (30 juin 2014) : 81–85. http://dx.doi.org/10.4283/jkms.2014.24.3.081.

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9

Feng, Peng, et Jianqiao Xie. « Optical resonant RKKY interaction in nanosystems ». Canadian Journal of Physics 93, no 11 (novembre 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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10

Nauman, Muhammad, Tayyaba Hussain, Joonyoung Choi, Nara Lee, Young Jai Choi, Woun Kang et Younjung Jo. « Low-field magnetic anisotropy of Sr2IrO4 ». Journal of Physics : Condensed Matter 34, no 13 (20 janvier 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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11

HUANG, WEN-MIN, HSIN-HUA LAI, CHENG-HUNG CHANG et HSIU-HAU LIN. « CARRIER-MEDIATED EXCHANGE COUPLING AND FERMI SURFACE TOPOLOGY ». International Journal of Modern Physics B 22, no 01n02 (20 janvier 2008) : 88–93. http://dx.doi.org/10.1142/s0217979208046098.

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We investigate the carrier-mediated exchange coupling between two ferromagnets, sandwiching an intermediate thin layer with Rashba interaction. The effective exchange coupling is obtained by integrating out the itinerant carriers. It turns out that the magnetic trends depend sensitively upon the topology of the Fermi surface. As the topology changes from “wedding cake” to “donut”, the mediated exchange goes from the oscillatory Ruderman-Kittel-Kasuya-Yosida to the non-collinear spiral interactions accordingly. It is rather surprising that the Fermi surface topology determines which type of magnetic interaction becomes dominant. Finally, we also discuss potential applications for carrier-mediated exchange coupling across the junction.
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12

Cizmas, Corneliu Bazil, et Lotfi Bessais. « A Study of Exchange Interactions in R(FeCo)11TiCy (R=Y or Pr) Compounds ». Solid State Phenomena 170 (avril 2011) : 223–26. http://dx.doi.org/10.4028/www.scientific.net/ssp.170.223.

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The exchange interactions in PrFe11-xCoxTiCy (x=0÷2, y≤1), are analyzed on the basis of the structural and magnetic properties of polycrystalline samples. The magnetic properties of polycrystalline isomorphous compounds YFe11-xCoxTiCy have been used in order to determine the T (T=Fe+Co) sub-lattice contributions, such as the T sub-lattice mean magnetic moment and the T-T exchange interaction strength. The exchange coupling parameters JTT, JRT and the recurrent molecular field coefficients nTT, nRT have been calculated in the molecular field approximation (MCA). The effects of Co content and carbonation on the R-T (T=Fe+Co) and on the T-T exchange interactions are analyzed.
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13

Zyuzin, A., B. Spivak, I. Vagner et P. Wyder. « Mesoscopic mechanism of exchange interaction in magnetic multilayers ». Physical Review B 62, no 21 (1 décembre 2000) : 13899–902. http://dx.doi.org/10.1103/physrevb.62.13899.

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14

Sun, Shih-Jye, Song-Shien Cheng et Hsiu-Hau Lin. « Spiral exchange interaction in diluted magnetic semiconductor junction ». Applied Physics Letters 84, no 15 (12 avril 2004) : 2862–64. http://dx.doi.org/10.1063/1.1705725.

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15

Stankiewicz, Jolanta, Fernando Palacio et Javier Campo. « Exchange interaction constants in CdCoSe diluted magnetic semiconductors ». Journal of Applied Physics 75, no 9 (mai 1994) : 4628–31. http://dx.doi.org/10.1063/1.355911.

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16

Liu, X. B., Z. Altounian, Xianghua Han, Narayan Poudyal et J. Ping Liu. « Magnetic state and exchange interaction in GdScGe:Ab initiostudy ». Journal of Applied Physics 113, no 17 (7 mai 2013) : 17E103. http://dx.doi.org/10.1063/1.4793604.

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17

Vincze, I., J. Balogh, Z. Fóris, D. Kaptás et T. Kemény. « Correlation between magnetic moment and exchange interaction distributions ». Solid State Communications 77, no 10 (mars 1991) : 757–61. http://dx.doi.org/10.1016/0038-1098(91)90570-l.

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18

Chen, Yunpeng, Xin Fan, Yang Zhou, Yunsong Xie, Jun Wu, Tao Wang, Siu Tat Chui et John Q. Xiao. « Designing and Tuning Magnetic Resonance with Exchange Interaction ». Advanced Materials 27, no 8 (9 janvier 2015) : 1351–55. http://dx.doi.org/10.1002/adma.201404447.

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19

Liu, Jian, Hartmut Buhmann, Elena G. Novik, Yongsheng Gui, Volkmar Hock, Charles R. Becker et Laurens W. Molenkamp. « Exchange interaction in magnetic HgMnTe quantum well structure ». physica status solidi (b) 243, no 4 (mars 2006) : 835–38. http://dx.doi.org/10.1002/pssb.200564610.

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20

Lascaray, J. P., F. Hamdani, D. Coquillat et A. K. Bhattacharjee. « Carrier-ion exchange interaction in diluted magnetic semiconductors ». Journal of Magnetism and Magnetic Materials 104-107 (février 1992) : 995–96. http://dx.doi.org/10.1016/0304-8853(92)90458-z.

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21

Zhang, Jiayu, Jian Wang, Chenyu Zhang, Zongbin Li, Juan Du et Yong Hu. « Prediction of Magnetocaloric Effect Induced by Continuous Modulation of Exchange Interaction : A Monte Carlo Study ». Materials 15, no 21 (4 novembre 2022) : 7777. http://dx.doi.org/10.3390/ma15217777.

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A magnetic-to-thermal energy conversion, derived from the continuous modulation of intrinsic exchange energy, is conceived and studied by performing Monte Carlo simulations. On the basis of thermodynamics and Weiss’s molecular field theories, we modified the Maxwell formula, where the magnetic entropy change (∆SM) is calculated by integrating the temperature derivative of magnetization under a continuously increasing exchange interaction, rather than an external magnetic field, from zero to a given value. For the conventional ∆SM induced through increasing magnetic field, the ∆SM maximum value is enhanced with increasing magnetic field, while the ∆SM peak temperature is weakly influenced by the magnetic field. On the contrary, the ∆SM induced by changing the exchange interaction is proportional to the exchange interaction while suppressed by a magnetic field. Another feature is that the relative cooling power calculated from the ∆SM induced by changing the exchange interaction is fully independent of the magnetic field perspective for obtaining the magnetically stabilized self-converted refrigerants. The controlled variation of exchange interaction could be realized by partial substitution or the application of hydrostatic pressure to lower the cost of magnetic energy at no expense of magnetocaloric response, which opens an avenue to develop the practical and energy-saving devices of conversion from magnetic energy to thermal energy, highly extending the material species of the magnetocaloric effect.
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22

Afremov, Leonid L., et Ilia Ilyushin. « Effect of Magnetic and Geometric Properties on the Time of Magnetic Relaxation of Superparamagnetic Core-Shell Nanoparticles ». Advanced Materials Research 821-822 (septembre 2013) : 1336–40. http://dx.doi.org/10.4028/www.scientific.net/amr.821-822.1336.

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Within the frame of two-phase superparamagnetic nanoparticles the effect of magnetic and geometric properties of superparamagnetic nanoparicles on the time of their magnetic relaxation has been defined. With increasing of volume, elongation of nanoparticle and relative volume of inclusions the time of relaxation grows rapidly. Metastability conditions of magnetic states have been developed. Growth of exchange constant magnitude of interphase interaction results in increasing of relaxation time regardless of exchange constant sign. Keywords: superparamagnetic particles, core-shell nanoparticles, relaxation time, magnetic states, critical field, metastable magnetic states, interphase exchange interaction.
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23

Thassana, Chewa, et Wicharn Techitdheera. « Coulomb and Exchange Interaction Effect on Magnetic Properties of MnO ». Applied Mechanics and Materials 110-116 (octobre 2011) : 492–96. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.492.

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This calculation focus on the effect of Coulomb interaction U and exchange interaction J on spin magnetic moment Msof MnO by using the local spin density approximation plus the Coulomb interaction (LSDA+U) method within full potential linear muffin-tin orbital (FP-LMTO). Our calculated results indicated that the spin magnetic moments correlated to U and J. The relevant results exhibited the increasing spin magnetic moments with increasing Coulomb interaction and exchange interaction. Furthermore, equation of spin magnetic moments, which good correspondence to the experimental data, were obtained and the relation of U and J parameter was defined.
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24

Dyszel, Peter, et Jason T. Haraldsen. « Thermodynamics of General Heisenberg Spin Tetramers Composed of Coupled Quantum Dimers ». Magnetochemistry 7, no 2 (22 février 2021) : 29. http://dx.doi.org/10.3390/magnetochemistry7020029.

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Advances in quantum computing technology have been made in recent years due to the evolution of spin clusters. Recent studies have tended towards spin cluster subgeometries to understand more complex structures better. These molecular magnets provide a multitude of phenomena via exchange interactions that allow for advancements in spintronics and other magnetic system applications due to the possibility of increasing speed, data storage, memory, and stability of quantum computing systems. Using the Heisenberg spin–spin exchange Hamiltonian and exact diagonalization, we examine the evolution of quantum energy levels and thermodynamic properties for various spin configurations and exchange interactions. The XXYY quantum spin tetramer considered in this study consists of two coupled dimers with exchange interactions α1J and α1′J and a dimer–dimer exchange interaction α2J. By varying spin values and interaction strengths, we determine the exact energy eigenstates that are used to determine closed-form analytic solutions for the heat capacity and magnetic susceptibility of the system and further analyze the evolution of the properties of the system based on the parameter values chosen. Furthermore, this study shows that the Schottky anomaly shifts towards zero as the ground-state of the system approaches a quantum phase transition between spin states. Additionally, we investigate the development of phase transitions produced by the convergence of the Schottky anomaly with both variable exchange interactions and external magnetic field.
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25

Zaspel, C. E., G. M. Wysin et B. A. Ivanov. « Magnetic Chiral Solitons Stabilized by Oersted Field at a Thin-Film Nanocontact with Electric Current ». Ukrainian Journal of Physics 64, no 10 (1 novembre 2019) : 933. http://dx.doi.org/10.15407/ujpe64.10.933.

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Static magnetic solitons in a thin film such as skyrmions are metastable states that can be stabilized through a balance of the exchange interaction and various relativistic interactions. One of the most effective stabilizing terms is the antisymmetric exchange along with others such as magnetostatic interactions in confined structures, as well as a current-carrying nanocontact on a thin ferromagnetic film. In this article, the effect of a nanocontact current on the energies of both topological (T-type) and nontopological (NT-type) solitons has been investigated. Without an antisymmetric exchange interaction, the Oersted field from a nanocontact can stabilize both soliton types with the NT soliton as the ground state. With the antisymmetric exchange, there is a critical nanocontact current, where the T soliton becomes the ground state.
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26

Grado-Caffaro, M. A., et M. Grado-Caffaro. « Exchange interaction in itinerant-electron metamagnetism ». Journal of Research in Physics 39, no 1 (1 juin 2018) : 31–34. http://dx.doi.org/10.2478/jrp-2018-0003.

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Abstract The exchange interaction in itinerant-electron metamagnetism is investigated theoretically. In fact, by considering spin-up and spin-down electrons in an itinerant-electron metamagnetic gas in the presence of an external magnetic field, we show that the difference between the Fermi energies of the spin-up and spin-down electrons equals, up to a multiplicative constant, the absolute value of the matrix element of the Hamiltonian operator relative to the interaction in question. Furthermore, the Stoner formula for the electronic energy of the gas is used to study the size of the exchange interaction.
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27

KIM, NAMMEE, T. W. KANG et HEESANG KIM. « CONTROLLABLE SPIN POLARIZATION IN A DMS QUANTUM DOT ». Modern Physics Letters B 19, no 27 (30 novembre 2005) : 1419–27. http://dx.doi.org/10.1142/s0217984905009353.

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The effects of electro-magnetic confining potentials and the s–d exchange interaction between substituted Mn ions and carriers on the spin polarization of carriers in an diluted magnetic semiconductor quantum dot are investigated within the framework of the effective-mass theory. The energy eigenvalues and wavefunctions of a single electron in the presence of an external magnetic field are studied by solving the one particle Schrödinger equation including the conventional Zeeman effect, the s–d exchange interaction and the electric confining potential which describes the dot. The eigenenergy structure for low lying states is strongly dependant on the relative sizes of the s–d exchange interactions and the conventional Zeeman energy splitting. When the spin splitting exceeds the cyclotron energy splitting, the Landau level overlappings occur so that the spin polarization of carriers is induced in low lying energy states. This spin polarization of carriers in the diluted magnetic semiconductor quantum dot can be controlled by changing the electro-magnetic confining potentials.
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28

Sharafullin, Ildus F., et Hung T. Diep. « Skyrmion Crystals and Phase Transitions in Magneto-Ferroelectric Superlattices : Dzyaloshinskii–Moriya Interaction in a Frustrated J1 − J2 Model ». Symmetry 12, no 1 (21 décembre 2019) : 26. http://dx.doi.org/10.3390/sym12010026.

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The formation of a skyrmion crystal and its phase transition are studied, taking into account the Dzyaloshinskii–Moriya (DM) interaction at the interface between a ferroelectric layer and a magnetic layer in a superlattice. Frustration is introduced in both magnetic and ferroelectric films. The films have a simple cubic lattice structure. The spins inside the magnetic layers are Heisenberg spins interacting with each other via nearest-neighbor (NN) exchange J m and next-nearest-neighbor (NNN) exchange J 2 m . The polarizations in the ferroelectric layers are assumed to be of Ising type with NN and NNN interactions J f and J 2 f . At the magnetoelectric interface, a DM interaction J m f between spins and polarizations is supposed. The spin configuration in the ground state is calculated by the steepest descent method. In an applied magnetic field H perpendicular to the layers, we show that the formation of skyrmions at the magnetoelectric interface is strongly enhanced by the frustration brought about by the NNN antiferromagnetic interactions J 2 m and J 2 f . Various physical quantities at finite temperatures are obtained by Monte Carlo simulations. We show the critical temperature, the order parameters of magnetic and ferroelectric layers as functions of the interface DM coupling, the applied magnetic field, and J 2 m and J 2 f . The phase transition to the disordered phase is studied in detail.
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29

Kovalev, A. S. « Magnetic vortices in media with spatially inhomogeneous exchange interaction ». Low Temperature Physics 47, no 9 (septembre 2021) : 774–83. http://dx.doi.org/10.1063/10.0005800.

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30

Ovchinnikov, S. G., V. A. Gavrichkov, S. I. Polukeev et A. V. Malakhovskii. « Exchange Interaction between the Excited States of Magnetic Ions ». Physics of Metals and Metallography 120, no 13 (décembre 2019) : 1333–36. http://dx.doi.org/10.1134/s0031918x19130210.

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31

Zhou, Yu-mei, Xing Gao et Ding-sheng Wang. « Exchange interaction and magnetic phase transition in FeRh alloy ». Journal of Magnetism and Magnetic Materials 226-230 (mai 2001) : 1042–44. http://dx.doi.org/10.1016/s0304-8853(00)01219-1.

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32

Riska, D. O. « The Magnetic Exchange Current and the Spin-Orbit Interaction ». Physica Scripta 31, no 2 (1 février 1985) : 107–21. http://dx.doi.org/10.1088/0031-8949/31/2/003.

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33

Wei, Xiao-Ping, Ya-Ling Zhang, Xiao-Wei Sun, Ting Song et Xing-Feng Zhu. « Electronic Structure and Magnetic Exchange Interaction in Fe2NiAs Compound ». Acta Physica Polonica A 132, no 4 (octobre 2017) : 1320–24. http://dx.doi.org/10.12693/aphyspola.132.1320.

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34

Loose, Claudia, Eliseo Ruiz, Berthold Kersting et Jens Kortus. « Magnetic exchange interaction in triply bridged dinickel(II) complexes ». Chemical Physics Letters 452, no 1-3 (février 2008) : 38–43. http://dx.doi.org/10.1016/j.cplett.2007.12.035.

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35

Deryabin, A. V., A. V. Tkov, V. K. Kazantsev, Yu A. Chirkov et I. V. Zakharov. « Concentration magnetic transitions in alloys with mixed exchange interaction ». physica status solidi (a) 95, no 1 (16 mai 1986) : 229–37. http://dx.doi.org/10.1002/pssa.2210950129.

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36

Valizadeh, Mohammad Mahdi, et Sashi Satpathy. « Magnetic exchange interaction in the spin-polarized electron gas ». physica status solidi (b) 253, no 11 (8 septembre 2016) : 2245–51. http://dx.doi.org/10.1002/pssb.201600188.

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37

Zhao, Hong-Yan, Ling-Zi Jiang, Yan Zhu, Yan-Fei Pan, Ji-Yu Fan et Chun-Lan Ma. « Magnetic exchange interaction in two-dimensional lattice under generalized Bloch condition ». Acta Physica Sinica 71, no 1 (2022) : 017105. http://dx.doi.org/10.7498/aps.71.20211317.

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Two-dimensional magnetic material which has been rapidly developed in recent years, has potential applications in developing spintronic devices. In order to understand the magnetic properties of two-dimensional magnetic materials, it is necessary to comprehend the magnetic interaction which is estimated by the exchange parameters between the magnetic atoms. The calculation of the magnetic exchange parameters is based on the first-principle. The commonly used method of determining the values of exchange parameters is energy-mapping. However, this method has some disadvantages. In this paper, the spin-spiral dispersion relationship is derived under the Heisenberg interaction and the Dzyaloshinskii-Moriya (DM) interaction through the generalized Bloch condition of three common two-dimensional magnetic structures: a tetragonal structure, a hexagonal structure in which the cell contains one magnetic atom, a hexagonal structure in which the cell contains two magnetic atoms. The magnetic exchange parameters of some materials are calculated through the first principle. These materials are MnB, VSe <sub>2</sub> MnSTe and Cr <sub>2</sub>I <sub>3</sub>Cl <sub>3</sub>. Among them, the MnSTe and Cr <sub>2</sub>I <sub>3</sub>Cl <sub>3</sub> are two-dimensional Janus materials, which means that they have space-reversal symmetry broken, that is why there is DM interaction in the system.
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38

Yokota, Takeshi, Takaaki Kuribayashi, Shotaro Murata et Manabu Gomi. « Preparation and Exchange Bias of a Cr2O3/(La0.7Sr0.3)MnO3 Magnetic Hetero Junction ». Key Engineering Materials 388 (septembre 2008) : 289–92. http://dx.doi.org/10.4028/www.scientific.net/kem.388.289.

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We investigated the magnetic interaction between antiferromagnetic, magnetoelectric Cr2O3 film and ferromagnetic La0.7Sr0.3MnO3 film, which shows colossal magneto-resistance. Magnetic properties and structural analyses revealed that a decrease in the thickness of La0.7Sr0.3MnO3 films gives rise to a change in magnetic anisotropy from perpendicular to in-plane. The exchange interaction between Cr2O3 and La0.7Sr0.3MnO3 also changed depending on the magnetic properties of La0.7Sr0.3MnO3. This suggests that the crystallographical control and the selection of a suitable thickness of La0.7Sr0.3MnO3 are important to obtain an exchange interaction in the magnetic hetero system using colossal magneto-resistance material.
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39

Yan, Sun, Gao Ruwei, Han Baiping, Liu Min, Han Guangbing et Feng Weicun. « Exchange-coupling interaction, effective anisotropy and magnetic property of nano-magnetic materials ». Progress in Natural Science 17, no 2 (1 février 2007) : 131–37. http://dx.doi.org/10.1080/10020070612331343236.

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Schmeltzer, D. « PAIRING OF HOLES INDUCED BY MAGNETIC INTERACTIONS ». International Journal of Modern Physics B 02, no 05 (octobre 1988) : 803–10. http://dx.doi.org/10.1142/s0217979288000627.

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We consider a planar Hubbard model with three sites per primitive cell. This model is mapped into a magnetic Hamiltonian. The charged holes interact via the magnetic interaction. The effect of this interaction is to create a magnetic background for the holes. Defining new quasi-particles we find that the many-body interaction becomes attractive and gives rise to conventional superconductivity. At large hole concentrations the critical temperature is determined by the antiferromagnetic exchange between copper-copper. In addition, the Increase of hole concentration reduces the exchange coupling which vanishes at some critical values. At small hole concentrations the critical temperature is determined by the Bose Einstein condensation temperature.
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41

Thai, Vu Kim, Le Duc Anh et Hoang Anh Tuan. « Effect of the direct exchange interaction between magnetic impurities on magnetization in diluted magnetic semiconductors ». Communications in Physics 22, no 1 (7 mai 2012) : 53–58. http://dx.doi.org/10.15625/0868-3166/22/1/186.

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We consider a model of III-V diluted magnetic semiconductors where both of the exchange interaction between carrier and impurity spins, and the direct exchange interaction between magnetic impurities are taken into account. The magnetization as a function of temperature for a wide range of model parameters is calculated and discussed. We show that for a degenerate carrier system the suppression of the magnetization is sensitive to the antiferromagnetic coupling constant and the impurity concentration.
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42

Kostyuchenko, M. V. « Finite Size Effects in Magnetic Multilayers Induced by Interaction with the Substrate ». Solid State Phenomena 233-234 (juillet 2015) : 43–46. http://dx.doi.org/10.4028/www.scientific.net/ssp.233-234.43.

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The technique of finite difference equations is used for analytical investigation of magnetization pattern in magnetic multilayers. The magnetic multilayers with equal magnetic layers and ferrimagnetic multilayers are considered. Heisenberg and biquadratic exchange interactions and uniaxial anisotropy are taken into account. The analytical dependencies of total magnetic moment on external magnetic field are obtained taking into account the strong interaction with the substrate. The significant difference in the behavior of magnetic moment is derived for ferrimagnetic multilayers with odd and even layers number.
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Wu, Kai, Sheng Yang, Yuelei Zhao, Xue Liang, Xiangjun Xing et Yan Zhou. « Tunable skyrmion–edge interaction in magnetic multilayers by interlayer exchange coupling ». AIP Advances 12, no 5 (1 mai 2022) : 055210. http://dx.doi.org/10.1063/5.0084546.

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Magnetic skyrmions are appealing for applications in emerging topological spintronic devices. However, when magnetic skyrmions in a nanowire are driven by an in-plane current, a transverse Magnus force deflects their trajectories from the current direction, which tends to push the skyrmion toward the edge. If the current density is exceedingly large, the skyrmion will be annihilated around the edge, leading to a greatly reduced propagation distance and a maximum speed of the skyrmion, which is detrimental to skyrmion-based spintronic applications. Here, we prepare a magnetic multilayer Ta/[Pt/Co]3/Ru/[Co/Pt]3 and tailor the interlayer exchange coupling strength by varying the thickness of the Ru layer. Based on the magneto-optic Kerr effect microscope, we find that the skyrmion–edge interaction is tunable by the interlayer exchange coupling strength, namely, the strength of the repulsive potential from the film edge is tailored by the interlayer exchange coupling strength. Our results unveil the significant role of the interlayer exchange coupling in skyrmion dynamics.
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Богословский, Н. А., П. В. Петров et Н. С. Аверкиев. « Примесная магнитная восприимчивость полупроводников в случае прямого обменного взаимодействия в модели Изинга ». Физика твердого тела 61, no 11 (2019) : 2036. http://dx.doi.org/10.21883/ftt.2019.11.48404.538.

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The dependence of the impurity magnetic susceptibility on temperature was studied by numerical simulation. The direct exchange interaction of magnetic moments of randomly distributed impurities was considered within the Ising model. The dependence of the magnetic susceptibility in such a system deviates from the Curie law at low temperature, which is associated with the formation of a spin glass phase. It is shown that the pre-exponential factor of the direct exchange interaction significantly influences on the temperature dependence of the magnetic susceptibility only in the case of ferromagnetic exchange.
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45

Danilyuk, A. L., A. V. Kukharev, U. A. Zaitsau et S. L. Prischepa. « Indirect Exchange Coupling in Carbon Nanotubes ». Doklady BGUIR 20, no 2 (5 avril 2022) : 13–20. http://dx.doi.org/10.35596/1729-7648-2022-20-2-13-20.

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Nanostructured magnetic composites based on carbon nanotubes (CNTs) and ferromagnetic nanoparticles (FNPs) are of great interest both from an applied and fundamental point of view. In particular, one of the features of CNTs with FNPs is the possibility of magnetic interaction of nanoparticles through the conducting medium of CNTs. For a detailed description of this special type of interaction, which is the indirect exchange coupling, it is necessary to establish the relationship between the macroscopic and microscopic parameters of the physical system. In nanostructured ferromagnets, these dependences are described within the framework of a random magnetization model in which the spin system and, consequently, the main macroscopic characteristics (coercivity, susceptibility, and saturation magnetization) are determined by such microscopic parameters as the exchange interaction constant, the FNP magnetization, the local magnetic anisotropy constant, and the grain size. In this paper, on the basis of the previously obtained microscopic parameters of CNT – FNP nanocomposites, the possibility of obtaining long-range magnetic correlations through the indirect exchange coupling (IEC) between FNP embedded inside a multi-wall CNT (MWCNT) is considered. A model Hamiltonian is used that takes into account the diameter, chirality, chemical potential and spin-orbit interaction (SOI) in the system. The reason for the appearance of a noticeable SOI in CNTs is the curvature of the tubes, which significantly increases the SOI compared to graphene, as well as possible defects and the presence of FNP. IEC is realized by means of p-electrons of the inner wall of the MWCNT. The propagation of the spin susceptibility along the MWCNT axis is calculated and it is shown that a long-range magnetic order is realized under the condition that the chemical potential enters the gap opened by the SOI. Coherence is realized at distances up to micrometers. The proposed approach also made it possible to estimate the energy of the exchange interaction between the FNP belonging to one CNT. The results obtained indicate the prospects for the use of CNT– FNP nanocomposites in carbon spintronics.
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Zhang, Huiyan, Jia Tan, Xue Zhang, Jiazhe Yan, Han Shi, Ye Zhu, Weizhong Cheng, Hailing Li, Weihuo Li et Ailin Xia. « Correlation between Magnetocaloric Properties and Magnetic Exchange Interaction in Gd54Fe36B10−xSix Amorphous Alloys ». Materials 16, no 10 (10 mai 2023) : 3629. http://dx.doi.org/10.3390/ma16103629.

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Gd54Fe36B10−xSix (x = 0, 2, 5, 8, 10) amorphous ribbons were fabricated by melt-spinning technique. Based on the molecular field theory, the magnetic exchange interaction was analyzed by constructing the two-sublattice model and deriving the exchange constants JGdGd, JGdFe and JFeFe. It was revealed that appropriate substitution content of Si for B can improve the thermal stability, maximum magnetic entropy change and widened table-like magnetocaloric effect of the alloys, while excessive Si will lead to the split of the crystallization exothermal peak, inflection-like magnetic transition and deterioration of magnetocaloric properties. These phenomena are probably correlated to the stronger atomic interaction of Fe-Si than that of Fe-B, which induced the compositional fluctuation or localized heterogeneity and then caused the different way of electron transfer and nonlinear variation in magnetic exchange constants, magnetic transition behavior and magnetocaloric performance. This work analyzes the effect of exchange interaction on magnetocaloric properties of Gd-TM amorphous alloys in detail.
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Bychkov, Igor V., Vasiliy D. Buchelnikov, D. A. Kuzmin et V. V. Shadrin. « Spectrum of the Coupled Waves in Magnetics Having the Ferromagnetic Spiral ». Solid State Phenomena 190 (juin 2012) : 257–60. http://dx.doi.org/10.4028/www.scientific.net/ssp.190.257.

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The spectrum of coupling spin and electromagnetic waves for magnetic having spiral magnetic structure defined by non-uniform exchange and relativistic interactions have been received. The possibility of resonant interaction of spin and electromagnetic waves has been shown. The electromagnetic waves reflectance for the layer of magnetic having ferromagnetic spiral has been calculated for different angles of spiral.
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Ivanov, Aleksei, Pavel F. Bessarab, Valery M. Uzdin et Hannes Jónsson. « Magnetic exchange force microscopy : theoretical analysis of induced magnetization reversals ». Nanoscale 9, no 35 (2017) : 13320–25. http://dx.doi.org/10.1039/c7nr04036a.

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In magnetic exchange force microscopy a magnetic tip is scanned over the surface of a solid and an image representing the exchange interaction recorded. Theoretical calculations are presented showing how lifetime of the magnetic states depends on tip size, distance and magnetic field.
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Jabar, A., R. Masrour, A. Benyoussef et M. Hamedoun. « Magnetic properties and Binder cumulants of a mixed spin-2 and spin-5/2 Ising diamond chain ». International Journal of Modern Physics B 31, no 28 (9 novembre 2017) : 1750208. http://dx.doi.org/10.1142/s0217979217502083.

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The mixed spin-2 and spin-5/2 Ising diamond chain is studied using Monte Carlo simulation. The thermal variation of magnetization and magnetic susceptibilities are obtained in diamond chain. The values of transition temperatures of a mixed spin-2 and spin-5/2 Ising diamond chain have been obtained for different sizes of system N, for different crystal field and for different exchange interactions. The Binder cumulant of magnetization [Formula: see text] is investigated. The magnetization with the crystal field and the exchange interaction has been established. The magnetic hysteresis cycle is determined for different values of the crystal field, exchange interactions and temperatures. The system presents the superparamagnetic behavior for a fixed crystal field and temperature value.
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Matsubara, Masakazu. « Ultrafast Optical Control of Magnetic Interactions in Carrier-Density-Controlled Ferromagnetic Semiconductors ». Applied Sciences 9, no 5 (6 mars 2019) : 948. http://dx.doi.org/10.3390/app9050948.

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Investigation of the interaction of ultrashort laser pulses with magnetically ordered materials has become a fascinating research topic in modern magnetism. Especially, the control of magnetic order by sub-ps laser pulses has become a fundamentally important topic with a high potential for future spintronics applications. This paper will review the recent success in optically controlling the magnetic interactions in carrier-density-controlled ferromagnetic semiconductor EuO doped with Gd ions. When the Gd concentration is low, the magnitude of the magnetic interaction is enhanced by the irradiation of ultrashort laser pulses, whereas it is attenuated when the Gd concentration is high. In ferromagnetic Eu1−xGdxO, we thereby demonstrate the strengthening as well as the weakening of the magnetic interaction by 10% and within 3 ps by optically controlling the magnetic exchange interaction. This principle—ultrafast optical control of magnetic interaction—can be applied to future ultrafast opto-spintronics.
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