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Articles de revues sur le sujet « Orbital Magnetization »

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Auteur : Grafiati
Publié le 11 mars 2023

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1

Cheng, Fang, Wang Zhi-Gang, Li Shu-Shen et Zhang Ping. « Orbital magnetization in semiconductors ». Chinese Physics B 18, no 12 (décembre 2009) : 5431–36. http://dx.doi.org/10.1088/1674-1056/18/12/050.

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2

THONHAUSER, T. « THEORY OF ORBITAL MAGNETIZATION IN SOLIDS ». International Journal of Modern Physics B 25, no 11 (30 avril 2011) : 1429–58. http://dx.doi.org/10.1142/s0217979211058912.

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In this review article, we survey the relatively new theory of orbital magnetization in solids — often referred to as the "modern theory of orbital magnetization" — and its applications. Surprisingly, while the calculation of the orbital magnetization in finite systems such as atoms and molecules is straight forward, in extended systems or solids it has long eluded calculations owing to the fact that the position operator is ill-defined in such a context. Approaches that overcome this problem were first developed in 2005 and in the first part of this review we present the main ideas reaching from a Wannier function approach to semi-classical and finite-temperature formalisms. In the second part, we describe practical aspects of calculating the orbital magnetization, such as taking k-space derivatives, a formalism for pseudopotentials, a single k-point derivation, a Wannier interpolation scheme, and DFT specific aspects. We then show results of recent calculations on Fe, Co, and Ni. In the last part of this review, we focus on direct applications of the orbital magnetization. In particular, we will review how properties such as the nuclear magnetic resonance shielding tensor and the electron paramagnetic resonance g-tensor can be elegantly calculated in terms of a derivative of the orbital magnetization.
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3

Simon, Steven H., Ady Stern et Bertrand I. Halperin. « Composite fermions with orbital magnetization ». Physical Review B 54, no 16 (15 octobre 1996) : R11114—R11117. http://dx.doi.org/10.1103/physrevb.54.r11114.

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4

Resta, R., Davide Ceresoli, T. Thonhauser et David Vanderbilt. « Orbital Magnetization in Extended Systems ». ChemPhysChem 6, no 9 (12 septembre 2005) : 1815–19. http://dx.doi.org/10.1002/cphc.200400641.

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5

LEE, Soogil, Nyun Jong LEE, Min-Gu KANG et Byong-Guk PARK. « Magnetization Control through the Orbital Current : Orbitronics beyond Spintronics ». Physics and High Technology 29, no 10 (31 octobre 2020) : 16–21. http://dx.doi.org/10.3938/phit.29.035.

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A recent study on orbital current, as a result of the orbital Hall effect, has received much attention because it is expected to provide energy-efficient electrical magnetization control in emerging spintronic devices. In this article, we introduce the concept of the orbital-current-induced spin torque, which is called the orbital torque, and discuss the advantages of using the orbital current for magnetization switching. We also summarize the recent theoretical and experimental results for the orbital current and the orbital torque in various material systems.
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6

Trama, Mattia, Vittorio Cataudella, Carmine Antonio Perroni, Francesco Romeo et Roberta Citro. « Tunable Spin and Orbital Edelstein Effect at (111) LaAlO3/SrTiO3 Interface ». Nanomaterials 12, no 14 (20 juillet 2022) : 2494. http://dx.doi.org/10.3390/nano12142494.

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Converting charge current into spin current is one of the main mechanisms exploited in spintronics. One prominent example is the Edelstein effect, namely, the generation of a magnetization in response to an external electric field, which can be realized in systems with lack of inversion symmetry. If a system has electrons with an orbital angular momentum character, an orbital magnetization can be generated by the applied electric field, giving rise to the so-called orbital Edelstein effect. Oxide heterostructures are the ideal platform for these effects due to the strong spin–orbit coupling and the lack of inversion symmetries. Beyond a gate-tunable spin Edelstein effect, we predict an orbital Edelstein effect an order of magnitude larger then the spin one at the (111) LaAlO3/SrTiO3 interface for very low and high fillings. We model the material as a bilayer of t2g orbitals using a tight-binding approach, whereas transport properties are obtained in the Boltzmann approach. We give an effective model at low filling, which explains the non-trivial behaviour of the Edelstein response, showing that the hybridization between the electronic bands crucially impacts the Edelstein susceptibility.
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7

Suzuki, Kenji, et Yoshiyuki Ono. « Orbital Magnetization in Quantum Hall Regime ». Journal of the Physical Society of Japan 66, no 11 (15 novembre 1997) : 3536–42. http://dx.doi.org/10.1143/jpsj.66.3536.

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8

Entin-Wohlman, O., Y. Imry, A. G. Aronov et Y. Levinson. « Orbital magnetization in the hopping regime ». Physical Review B 51, no 17 (1 mai 1995) : 11584–96. http://dx.doi.org/10.1103/physrevb.51.11584.

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9

KUSMARTSEV, F. V. « ORBITAL PARAMAGNETISM IN TWO-DIMENSIONAL LATTICES ». Modern Physics Letters B 05, no 08 (10 avril 1991) : 571–79. http://dx.doi.org/10.1142/s021798499100068x.

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We calculate the ground state energy and the magnetization of spinless fermions on a two-dimensional lattice in an external magnetic field. We prove that the absolute minimum of the energy corresponds to a flux value equal to the filling, i.e. the “commensurate flux phase” state is preferable. The magnetization of these fermions has a paramagnetic character of special orbital type.
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10

Tschirhart, C. L., M. Serlin, H. Polshyn, A. Shragai, Z. Xia, J. Zhu, Y. Zhang et al. « Imaging orbital ferromagnetism in a moiré Chern insulator ». Science 372, no 6548 (27 mai 2021) : 1323–27. http://dx.doi.org/10.1126/science.abd3190.

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Electrons in moiré flat band systems can spontaneously break time-reversal symmetry, giving rise to a quantized anomalous Hall effect. In this study, we use a superconducting quantum interference device to image stray magnetic fields in twisted bilayer graphene aligned to hexagonal boron nitride. We find a magnetization of several Bohr magnetons per charge carrier, demonstrating that the magnetism is primarily orbital in nature. Our measurements reveal a large change in the magnetization as the chemical potential is swept across the quantum anomalous Hall gap, consistent with the expected contribution of chiral edge states to the magnetization of an orbital Chern insulator. Mapping the spatial evolution of field-driven magnetic reversal, we find a series of reproducible micrometer-scale domains pinned to structural disorder.
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11

Liu, Junfeng, Zhongshui Ma, A. R. Wright et Chao Zhang. « Orbital magnetization of graphene and graphene nanoribbons ». Journal of Applied Physics 103, no 10 (15 mai 2008) : 103711. http://dx.doi.org/10.1063/1.2930875.

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12

Galperin, Y., et O. Entin-Wohlman. « Nonequilibrium orbital magnetization of strongly localized electrons ». Physical Review B 54, no 13 (1 octobre 1996) : 9346–52. http://dx.doi.org/10.1103/physrevb.54.9346.

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13

TRYGG, JOAKIM, LARS NORDSTRÖM et BÖRJE JOHANSSON. « FIRST-PRINCIPLES CALCULATION OF THE MAGNETOCRYSTALLINE ANISOTROPY ENERGY FOR THE PSEUDOBINARY COMPOUND Y(Co1−xFex)5 ». International Journal of Modern Physics B 07, no 01n03 (janvier 1993) : 745–48. http://dx.doi.org/10.1142/s0217979293001578.

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From the experimental behavior of the magnetocrystalline anisotropy energies of the pseudobinary compounds Y(Co1−xFex)5, it has been argued that the magnetocrystalline anisotropy energies for YCo5 and the hypothetical compound YFe5 will have different signs. This anomalous behavior is attributed to the change of the number of 3d electrons and their orbital moments when proceeding from YFe5 to YCo5. The magnetocrystalline anisotropy energies are calculated using the linear muffin-tin orbital (LMTO) method in the atomic sphere approximation (ASA) including spin-orbit interaction and orbital polarization. The force-theorem is used to express the total energy difference (between the two directions of magnetization) as a difference in the sum of the single particle eigenvalues. We find that it is possible to predict the correct easy-axis for YCo5 and YFe5. Secondly it is found that the inclusion of orbital polarization is essential for the cobalt compound but less important for the iron compound. The different contributions from the two inequivalent transition metal sites to the anisotropy energy and orbital magnetization are discussed.
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14

Resta, Raffaele. « Electrical polarization and orbital magnetization : the modern theories ». Journal of Physics : Condensed Matter 22, no 12 (11 mars 2010) : 123201. http://dx.doi.org/10.1088/0953-8984/22/12/123201.

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15

Potasz, P., et J. Fernández-Rossier. « Orbital Magnetization of Quantum Spin Hall Insulator Nanoparticles ». Nano Letters 15, no 9 (11 août 2015) : 5799–803. http://dx.doi.org/10.1021/acs.nanolett.5b01805.

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16

Brooks, M. S. S., O. Eriksson, L. Severin et B. Johansson. « Spin and orbital magnetization densities in itinerant magnets ». Physica B : Condensed Matter 192, no 1-2 (octobre 1993) : 39–49. http://dx.doi.org/10.1016/0921-4526(93)90106-g.

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17

Huang, Le, Peng Zhang, Nengjie Huo, Huafeng Dong, Hui-Xiong Deng, Zhongming Wei et Jingbo Li. « Orbital localization induced magnetization in nonmetal-doped phosphorene ». Journal of Physics D : Applied Physics 53, no 15 (5 février 2020) : 155001. http://dx.doi.org/10.1088/1361-6463/ab6b97.

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18

Alisultanov, Z. Z. « Strain-Induced Orbital Magnetization in a Weyl Semimetal ». JETP Letters 107, no 4 (février 2018) : 254–58. http://dx.doi.org/10.1134/s0021364018040033.

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19

Song, Yougui, Xiaomin Fang, John W. King, Jijun Li, Ishikawa Naoto et Zhisheng An. « Magnetic parameter variations in the Chaona loess/paleosol sequences in the central Chinese Loess Plateau, and their significance for the middle Pleistocene climate transition ». Quaternary Research 81, no 3 (mai 2014) : 433–44. http://dx.doi.org/10.1016/j.yqres.2013.10.002.

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AbstractA high-resolution rock magnetic investigation was performed on the Chaona Quaternary loess/paleosol sequences in the Central Chinese Loess Plateau. Based on a newly developed independent unturned time scale and magnetic records, we reconstructed the history of the East Asia monsoons during the last 3 Ma and explored the middle Pleistocene climate transition (MPT). Rock magnetic results show that the loess layers are characterized by relatively high coercivity and remanent coercivity, lower magnetic susceptibility (MS), and that the paleosol layers are characterized by relatively high MS, saturation magnetization and remanent saturation magnetization. Spectrum analyses indicate that there are various periods in addition to orbital periodicities. According to the onset and stable appearance of 100 kyr period, we consider that the MPT recorded in this section began at ~ 1.26 Ma and was completed by ~ 0.53 Ma, which differs from previous investigations based on orbitally tuned time scales. The forcing mechanism for the MPT was more complicated than just the orbital forcing. We conclude that the rapid uplift of the Tibetan Plateau may have played an important role in the shift of periodicities during the middle Pleistocene.
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20

Aldoshin, Sergey M., Denis V. Korchagin, Andrew V. Palii et Boris S. Tsukerblat. « Some new trends in the design of single molecule magnets ». Pure and Applied Chemistry 89, no 8 (26 juillet 2017) : 1119–43. http://dx.doi.org/10.1515/pac-2017-0103.

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AbstractIn this review we briefly discuss some new trends in the design of single molecule magnets based on transition (3d, 4d, 5d) and rare-earth (4f) metal ions. Within this broad theme the emphasis of the present review is placed on the molecules which exhibit strong magnetic anisotropy originating from the unquenched orbital angular momenta in the ground orbitally degenerate (or quasi-degenerate) states. Along with the general concepts we consider selected examples of the systems comprising orbitally-degenerate metal ions and demonstrate how one can benefit from strong single-ion anisotropy arising from the first-order orbital angular momentum. The role of crystal fields, spin-orbit coupling and structural factors is discussed. Some observation stemming from the analysis of the isotropic exchange interactions, magnetic anisotropy and strongly anisotropic orbitally-dependent superexchange are summarized as guiding rules for the controlled design of single molecule magnets exhibiting high barriers for magnetization reversal and, consequently, high blocking temperatures.
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21

Okulov, Vsevolod, et Evgeny Pamyatnykh. « Thermodynamic aspects of describing the contribution of spontaneous magnetism of electrons to the Hall resistance ». EPJ Web of Conferences 185 (2018) : 01017. http://dx.doi.org/10.1051/epjconf/201818501017.

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On the base of the analysis of quantum-statistical description of the magnetization of electron system containing the spontaneous spin polarization contribution there were found the magnetization and conduction current densities in equilibrium state. It has been shown that equilibrium surface conduction current ensures realization of demagnetization effects but in local equilibrium state determines local equilibrium part of the Hall conductivity. As a result one is given the justification of influence of the spontaneous magnetization on galvanomagnetic effects, which is not related to spin-orbital interaction.
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22

Kundu, A., et S. Zhang. « Effect of laser induced orbital momentum on magnetization switching ». Journal of Magnetism and Magnetic Materials 454 (mai 2018) : 165–69. http://dx.doi.org/10.1016/j.jmmm.2018.01.080.

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23

Jo, Takeo. « X-Ray Magnetic Circular Dichroism, Symmetry and Orbital Magnetization ». Journal of the Physical Society of Japan 62, no 5 (15 mai 1993) : 1814–15. http://dx.doi.org/10.1143/jpsj.62.1814.

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Ye, Xing-Guo, Peng-Fei Zhu, Wen-Zheng Xu, Nianze Shang, Kaihui Liu et Zhi-Min Liao. « Orbit-Transfer Torque Driven Field-Free Switching of Perpendicular Magnetization ». Chinese Physics Letters 39, no 3 (1 février 2022) : 037303. http://dx.doi.org/10.1088/0256-307x/39/3/037303.

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The reversal of perpendicular magnetization (PM) by electric control is crucial for high-density integration of low-power magnetic random-access memory. Although the spin-transfer torque and spin-orbit torque technologies have been used to switch the magnetization of a free layer with perpendicular magnetic anisotropy, the former has limited endurance because of the high current density directly through the junction, while the latter requires an external magnetic field or unconventional configuration to break the symmetry. Here we propose and realize the orbit-transfer torque (OTT), that is, exerting torque on the magnetization using the orbital magnetic moments, and thus demonstrate a new strategy for current-driven PM reversal without external magnetic field. The perpendicular polarization of orbital magnetic moments is generated by a direct current in a few-layer WTe2 due to the existence of nonzero Berry curvature dipole, and the polarization direction can be switched by changing the current polarity. Guided by this principle, we construct the WTe2/Fe3GeTe2 heterostructures to achieve the OTT driven field-free deterministic switching of PM.
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Ito, Masahisa, Yoshiaki Oba, Ayako Sato, Kosuke Suzuki, Tatsuki Tadenuma, Ryota Nagayasu, Hiroshi Sakurai et Hiromichi Adachi. « Spin and Orbital Magnetic Moment of Pd3Co Evaluated by X-Ray Magnetic Diffraction Experiment ». Key Engineering Materials 459 (décembre 2010) : 3–6. http://dx.doi.org/10.4028/www.scientific.net/kem.459.3.

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We have measured spin and orbital magnetic form factors of Pd3Co for various reciprocal lattice points by the X-ray magnetic diffraction. Observed spin and orbital magnetic form factors are fitted by theoretical curves of the isolated atomic model under the dipole approximation. By the fitting analysis we have evaluated separately the spin and orbital component of the magnetic moment of Pd3Co alloy as 2.19 µB/f.u. and 0.83 µB/f.u., respectively. The total magnetic moment 3.02 µB/f.u. is comparable to the value of 2.93 µB/f.u. obtained by the magnetization measurement.
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Kato, Tadashi, Kosuke Suzuki, Shouta Takubo, Yoshiya Homma, Masayoshi Itou, Yoshiharu Sakurai et Hiroshi Sakurai. « Perpendicular Magnetic Anisotropy in Fe/MgO Multilayer Film Measured by Magnetic Compton Scattering ». Applied Mechanics and Materials 423-426 (septembre 2013) : 271–75. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.271.

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We have measured magnetic Compton scattering (MCS) for an Fe/MgO multilayer film at several magnetic field applying perpendicular to film plane. A spin specific magnetic hysteresis (SSMH) loop is obtained by the MCS for the Fe/MgO multilayer film. A knickpoint is observed in the SSMH loop around the magnetic field of 0.5 T. Orbital magnetization is enhanced within the magnetic field from-0.5 T to 0.5 T. A decomposition analysis for magnetic Compton profiles shows the suppressed |m|=0 states and enhanced |m|=1 and 2 states within the magnetic field from-0.5 T to 0.5 T. Heremdenotes magnetic quantum number. The knickpoint corresponds to a perpendicular magnetic anisotropy, which comes from the enhanced |m|=1 and 2 state and orbital magnetization in the Fe/MgO multilayer.
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27

Kirman, Marina, et Roman Morgunov. « Effect of spin-orbital interaction on continuous and jumpwise reversal magnetization in [Mn(II)(HL)(H2O)][Mn(III)(CN)6]·2H2O molecular ferrimagnet ». EPJ Web of Conferences 185 (2018) : 04016. http://dx.doi.org/10.1051/epjconf/201818504016.

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Magnetic jumps were revealed during the magnetization reversal of [Mn(II)(HL)(H2O)][Mn(III)(CN)6]·2H2O molecular ferrimagnet. Amplitudes of the jumps were 0.01 – 0.1 % of the saturation magnetization. Fourier transform of the time series of jumps magnetization indicates that frequency spectrum is close to the white noise. Statistic distribution of the jumps versus time reveals the appearance of the most jumps at the beginning of the demagnetization. Effect of spin-orbit coupling on statistical distribution of magnetization jumps was considered by comparison of two compounds with different single ion anisotropies. The increase of spin-orbit interaction leads to the decrease of power of spectral density of magnetization jumps.
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Thole, B. T., P. Carra, F. Sette et G. van der Laan. « X-ray circular dichroism as a probe of orbital magnetization ». Physical Review Letters 68, no 12 (23 mars 1992) : 1943–46. http://dx.doi.org/10.1103/physrevlett.68.1943.

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Grübel, G. « Study of orbital and spin magnetization densities in magnetic materials ». Acta Crystallographica Section A Foundations of Crystallography 52, a1 (8 août 1996) : C498. http://dx.doi.org/10.1107/s0108767396079652.

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Geller, Michael R., et G. Vignale. « Equilibrium current and orbital magnetization in the quantum Hall fluid ». Physica B : Condensed Matter 212, no 3 (août 1995) : 283–88. http://dx.doi.org/10.1016/0921-4526(95)00045-b.

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31

Schulz-Baldes, Hermann, et Stefan Teufel. « Orbital Polarization and Magnetization for Independent Particles in Disordered Media ». Communications in Mathematical Physics 319, no 3 (25 décembre 2012) : 649–81. http://dx.doi.org/10.1007/s00220-012-1639-0.

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Itou, M., A. Koizumi et Y. Sakurai. « Spin and orbital magnetization loops obtained using magnetic Compton scattering ». Applied Physics Letters 102, no 8 (25 février 2013) : 082403. http://dx.doi.org/10.1063/1.4793755.

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Aplesnin, Sergei S., Maksim N. Sitnikov, Oksana B. Romanova, Evgeniy V. Eremin, Vladimir V. Sokolov et Andrei Yu Pichugin. « Magnetoresistance and Magnetic Properties CexMn1-xS ». Solid State Phenomena 233-234 (juillet 2015) : 419–22. http://dx.doi.org/10.4028/www.scientific.net/ssp.233-234.419.

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The transport and magnetic properties of cation-substituted manganese sulphides CexMn1-ХS in the 4K - 450K temperature range in magnetic fields up to 90 kOe are studied. The hysteresis of curve magnetization for X=0.01 and nonlinear field behavior of the magnetization at X = 0.05, the sharp Curie temperature drop were found. The sharp maximum in the temperature dependence of resistivity was observed. The shift of the maximum temperature to low temperatures at cerium ion concentration increasing and in magnetic field was established. Model of orbital polaron for explanation of experimental datа was used.
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Kolotov, I. I., D. V. Lukyanenko, I. E. Stepanova, Y. Wang et A. G. Yagola. « RECOVERING THE MAGNETIC PROPERTIES OF MERCURY FROM SATELLITE OBSERVATIONS ». Eurasian Journal of Mathematical and Computer Applications 10, no 2 (28 juin 2022) : 26–41. http://dx.doi.org/10.32523/2306-6172-2022-10-2-26-41.

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One of the possible approaches to reconstructing the map of the distribution of magnetization parameters in the Mercury’s crust from the data of the Messenger orbital mission is considered. Possible ways of increasing the accuracy of reconstructing the magnetic image of Mercury are discussed.
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Fanciulli, Mauro, Matteo Pancaldi, Emanuele Pedersoli, Mekha Vimal, David Bresteau, Martin Luttmann, Dario De Angelis et al. « Magnetic helicoidal dichroism with XUV light carrying orbital angular momentum ». Journal of Physics : Conference Series 2380, no 1 (1 décembre 2022) : 012129. http://dx.doi.org/10.1088/1742-6596/2380/1/012129.

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Abstract Circularly polarized light is a fundamental tool in magnetic studies, notably for magnetization dynamics. It is less common in magneto-optics to exploit the orbital angular momentum (OAM) of value ℓ carried by light beams possessing a helical wavefront. After finding many applications in the visible range, recently OAM pulses with ultra-short duration and XUV wavelengths became available, widening the range of experiments that can be envisaged. We modelled the interaction of an XUV OAM beam with non-uniform magnetic structures, showing that the far field scattered intensity profile encodes the symmetry of the magnetic structure in a way that depends on the sign and value of ℓ. In analogy with magnetic circular dichroism, this effect, named magnetic helicoidal dichroism (MHD), can be observed by inverting the sign of either the orbital momentum or of the magnetization. We obtained experimental evidence of MHD by measuring ℓ-dependent resonant scattering from a magnetic vortex. The results of recent complementary experiments match well the theoretical predictions, confirming the potential of the new toolset provided by MHD for studying the laser-triggered ultrafast dynamics of complex magnetic materials.
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Ishibashi, Hiroki, Hiroki Iwane, Shogo Kawaguchi et Yoshiki Kubota. « Structural and magnetic properties of spinel compound Fe1+xCoxV2O4 ». Acta Crystallographica Section A Foundations and Advances 70, a1 (5 août 2014) : C1357. http://dx.doi.org/10.1107/s2053273314086422.

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Vanadium spinel oxides AV2O4have attracted much attention for recent years because they show the peculiar physical properties which are caused by competition and cooperation of spin, orbital and lattice degrees of freedom. Among such compounds, FeV2O4is a unique compound showing successive phase transitions: cubic to tetragonal (c < a) at ~140 K, from tetragonal to orthorhombic accompanied by ferrimagnetic transition at ~110 K and from orthorhombic to tetragonal (c > a) at ~70 K with decreasing temperature. It is suggested that these phase transitions originate from the orbital degrees of freedom of both Fe2+ions at A-site (tetrahedral site) and V3+ones at B-site (octahedral site), however, the origin remains controversial. In the present study, we investigate the substitution effect of Fe2+with Co2+having no orbital degrees of freedom to clarify the role of the orbital degree of Fe2+at the A-site. We carried out magnetization and specific heat measurements and synchrotron powder diffraction experiments by the Debye-Scherrer camera at the beamline BL-8B at Photon Factory in KEK. For x ≤ 0.1, the successive structural transitions similar to that observed in FeV2O4occur although the transition temperature of cubic-to-tetraLT transition rapidly decreases with increasing x. For 0.2≤ x ≤ 0.6, the only structural transition from cubic to tetragonal (c < a) was observed, however, the transition temperatures were somewhat different from the ferrimagnetic transition ones. On the other hand, for x ≥ 0.7, the crystal structure remains cubic down to 10 K similar to that of CoV2O4. These structural properties are discussed in terms of the orbital states of Fe2+ions obtained by the normal mode analysis, and they are compared with the results of the specific heat and magnetization measurements.
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Ito, Naohiro, et Kentaro Nomura. « Anomalous Hall Effect and Spontaneous Orbital Magnetization in Antiferromagnetic Weyl Metal ». Journal of the Physical Society of Japan 86, no 6 (15 juin 2017) : 063703. http://dx.doi.org/10.7566/jpsj.86.063703.

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38

Chaplik, A. V., et L. I. Magarill. « Size and shape effects in the orbital magnetization of TMDs monolayers ». Journal of Physics : Condensed Matter 33, no 44 (24 août 2021) : 445301. http://dx.doi.org/10.1088/1361-648x/ac1b62.

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39

Wang, Si-Si, Yan-Yang Zhang, Ji-Huan Guan, Yan Yu, Yang Xia et Shu-Shen Li. « Numerical study of disorder on the orbital magnetization in two dimensions ». Journal of Physics : Condensed Matter 32, no 33 (20 mai 2020) : 335302. http://dx.doi.org/10.1088/1361-648x/ab8985.

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Zhang, A. M., S. L. Cheng, J. G. Lin et X. S. Wu. « Strain controlled orbital state and magnetization in insulating LaMnO3+δ films ». Journal of Applied Physics 117, no 17 (7 mai 2015) : 17B325. http://dx.doi.org/10.1063/1.4919226.

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Ying, Zu-Jian, Angela Foerster, Xi-Wen Guan, Bin Chen et Itzhak Roditi. « Magnetization plateau and quantum phase transitions in a spin-orbital model ». European Physical Journal B 38, no 4 (avril 2004) : 535–39. http://dx.doi.org/10.1140/epjb/e2004-00149-2.

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42

Brooks, M. S. S. « Theory of spin and orbital magnetization densities with screened exchange interactions ». Physica B : Condensed Matter 345, no 1-4 (mars 2004) : 93–95. http://dx.doi.org/10.1016/j.physb.2003.11.030.

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43

Zhou, R. J., Cz Kapusta, M. Rosenberg et K. H. J. Buschow. « Orbital magnetization and iron contribution to the magnetic anisotropy of Er2Fe17Cx ». Journal of Alloys and Compounds 184, no 2 (juin 1992) : 235–42. http://dx.doi.org/10.1016/0925-8388(92)90497-w.

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44

Töws, Waldemar, Gunnar Stegmann et G. M. Pastor. « Spin and Orbital Symmetry Breakings Central to the Laser-Induced Ultrafast Demagnetization of Transition Metals ». Symmetry 15, no 2 (9 février 2023) : 457. http://dx.doi.org/10.3390/sym15020457.

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The role of spin and orbital rotational symmetry on the laser-induced magnetization dynamics of itinerant-electron ferromagnets was theoretically investigated. The ultrafast demagnetization of transition metals is shown to be the direct consequence of the fundamental breaking of these conservation laws in the electronic system, an effect that is inherent to the nature of spin-orbit and electron-lattice interactions. A comprehensive symmetry analysis is complemented by exact numerical calculations of the time evolution of optically excited ferromagnetic ground states in the framework of a many-body electronic Hamiltonian. Thus, quantitative relations are established between the strength of the interactions that break the rotational symmetries and the time scales that are relevant for the magnetization dynamics.
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Michalik, J. M., J. M. De Teresa, C. Ritter, J. Blasco, D. Serrate, M. R. Ibarra, C. Kapusta, J. Freudenberger et N. Kozlova. « High-field magnetization measurements in Sr 2 CrReO 6 double perovskite : Evidence for orbital contribution to the magnetization ». Europhysics Letters (EPL) 78, no 1 (22 mars 2007) : 17006. http://dx.doi.org/10.1209/0295-5075/78/17006.

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Klahn, Emil Andreasen, Emil Damgaard-Møller, Lennard Krause, Iurii Kibalin, Arsen Gukasov, Shalini Tripathi, Abinash Swain, Maheswaran Shanmugam et Jacob Overgaard. « Quantifying magnetic anisotropy using X-ray and neutron diffraction ». IUCrJ 8, no 5 (1 septembre 2021) : 833–41. http://dx.doi.org/10.1107/s2052252521008290.

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In this work, the magnetic anisotropy in two iso-structural distorted tetrahedral Co(II) complexes, CoX 2tmtu2 [X = Cl(1) and Br(2), tmtu = tetramethylthiourea] is investigated, using a combination of polarized neutron diffraction (PND), very low-temperature high-resolution synchrotron X-ray diffraction and CASSCF/NEVPT2 ab initio calculations. Here, it was found consistently among all methods that the compounds have an easy axis of magnetization pointing nearly along the bisector of the compression angle, with minute deviations between PND and theory. Importantly, this work represents the first derivation of the atomic susceptibility tensor based on powder PND for a single-molecule magnet and the comparison thereof with ab initio calculations and high-resolution X-ray diffraction. Theoretical ab initio ligand field theory (AILFT) analysis finds the d xy orbital to be stabilized relative to the d xz and d yz orbitals, thus providing the intuitive explanation for the presence of a negative zero-field splitting parameter, D, from coupling and thus mixing of d xy and d_{x^2 - y^2}. Experimental d-orbital populations support this interpretation, showing in addition that the metal–ligand covalency is larger for Br-ligated 2 than for Cl-ligated 1.
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Zhang, Jianrong, Hongfei Xie, Xu Zhang, Ze Yan, Yongbo Zhai, Junhong Chi, Hengyi Xu, Yalu Zuo et Li Xi. « The giant orbital Hall effect in Cr/Au/Co/Ti multilayers ». Applied Physics Letters 121, no 17 (24 octobre 2022) : 172405. http://dx.doi.org/10.1063/5.0106988.

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The spin–orbit torques originating from the spin Hall effect of heavy metals are of vital importance for applications in spintronics due to its low consumption of energy. Theoretical calculations have predicted that 3 d and 4 d light metals can produce a similar amount of torques to heavy metals via the strong orbital Hall effect (OHE). However, few experiments have been conducted since it is technically challenging to directly detect the orbital current from the OHE. Here, we report an effective approach to demonstrate the strong orbital torques in the light metal Cr with the aid of a conversion process from the orbital current to the spin current by introducing an Au interfacial layer in the Cr/ferromagnet structures. A rather large orbital torque efficiency and an increase with the increasing thickness of the Cr-layer are attained in the perpendicularly magnetized Cr/Au/Co/Ti multilayers. Moreover, an energy efficient magnetization switching and the domain wall motion in Cr/Au/Co/Ti multilayers induced by the OHE have also been observed. Our findings confirm the existence of the orbital Hall torques in Cr and provide an effective way to investigate the OHE.
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Georgiev, Miroslav, et Hassan Chamati. « An Exchange Mechanism for the Magnetic Behavior of Er3+ Complexes ». Molecules 26, no 16 (13 août 2021) : 4922. http://dx.doi.org/10.3390/molecules26164922.

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We study the magnetic properties of the erbium based compounds, Na9[Er(W5O18)2] and [(Pc)Er{Pc{N(C4H9)2}8}]·/−, in the framework of an effective spin exchange model involving delocalized electrons occupying molecular orbitals. The calculations successfully reproduce the experimental data available in the literature for the magnetic spectrum, magnetization and molar susceptibility in dc and ac fields. Owing to their similar molecular geometry, the compounds’ magnetic behaviors are interpreted in terms of the same set of active orbitals and thus the same effective spin coupling scheme. For all three complexes, the model predicts a prompt change in the ground state from a Kramer’s doublet at zero fields to a fully polarized quartet one brought about by the action of an external magnetic field without Zeeman splitting. This alteration is attributed to the enhancement of the effect of orbital interactions over the spin exchange as the magnitude of the external magnetic field increases.
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Xiao, Cong, Yafei Ren et Bangguo Xiong. « Adiabatically induced orbital magnetization ». Physical Review B 103, no 11 (18 mars 2021). http://dx.doi.org/10.1103/physrevb.103.115432.

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50

Thonhauser, T., Davide Ceresoli, David Vanderbilt et R. Resta. « Orbital Magnetization in Periodic Insulators ». Physical Review Letters 95, no 13 (22 septembre 2005). http://dx.doi.org/10.1103/physrevlett.95.137205.

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