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Journal articles on the topic 'Antiferromagneten'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Gutschke, Siegfried O. H., Daniel J. Price, Annie K. Powell, and Paul T. Wood. "Solvothermalsynthese des verkanteten Antiferromagneten {K2[CoO3PCH2N(CH2CO2)2]}6⋅x H2O." Angewandte Chemie 111, no. 8 (April 19, 1999): 1158–60. http://dx.doi.org/10.1002/(sici)1521-3757(19990419)111:8<1158::aid-ange1158>3.0.co;2-h.

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2

CHANG, ZHE. "GREEN'S FUNCTION THEORY OF THE DOPED ANISOTROPIC ANTIFERROMAGNET." International Journal of Modern Physics B 14, no. 10 (April 20, 2000): 1037–57. http://dx.doi.org/10.1142/s0217979200001497.

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The Green's function theory of the t–J model is generalized to investigate phase diagram and magnetic properties of the doped anisotropic antiferromagnet, which is believed to describe the elementary properties of the high-temperature superconductors. Antiferromagnetic–metalic phase transition is shown. The explicit dependence of the Néel temperature and sublattice magnetization of the anisotropic doped antiferromagnets on anisotropic parameter ς, doping density δ and parameters of the t–J model are obtained for small doping concentration.

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3

Maniv, Eran, Nityan L. Nair, Shannon C. Haley, Spencer Doyle, Caolan John, Stefano Cabrini, Ariel Maniv, et al. "Antiferromagnetic switching driven by the collective dynamics of a coexisting spin glass." Science Advances 7, no. 2 (January 2021): eabd8452. http://dx.doi.org/10.1126/sciadv.abd8452.

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The theory behind the electrical switching of antiferromagnets is premised on the existence of a well-defined broken symmetry state that can be rotated to encode information. A spin glass is, in many ways, the antithesis of this state, characterized by an ergodic landscape of nearly degenerate magnetic configurations, choosing to freeze into a distribution of these in a manner that is seemingly bereft of information. Here, we show that the coexistence of spin glass and antiferromagnetic order allows a novel mechanism to facilitate the switching of the antiferromagnet Fe1/3 + δNbS2, rooted in the electrically stimulated collective winding of the spin glass. The local texture of the spin glass opens an anisotropic channel of interaction that can be used to rotate the equilibrium orientation of the antiferromagnetic state. Manipulating antiferromagnetic spin textures using a spin glass’ collective dynamics opens the field of antiferromagnetic spintronics to new material platforms with complex magnetic textures.

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4

Kalita, V. M., G. Yu Lavanov, and V. M. Loktev. "Magnetization and Magnetocaloric Effect in Antiferromagnets with Competing Ising Exchange and Single-Ion Anisotropies." Ukrainian Journal of Physics 65, no. 10 (October 9, 2020): 858. http://dx.doi.org/10.15407/ujpe65.10.858.

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The magnetization of a two-sublattice Ising antiferromagnet with easy-plane single-ion anisotropy, which is accompanied by two phase transitions, has been studied. The both phase transitions are induced by the magnetic field. One of them is isostructural, i.e., the system symmetry remains unchanged and a transition between two antiferromagnetic states with different sublattice magnetizations takes place. The other phase transition occurs when the antiferromagnetic state transforms into the ferromagnetic one. At both phase transitions, the field dependence of the system entropy has two successive positive jumps, which is not typical of ordinary antiferromagnets. On the other hand, if the temperature of the system is higher than the tricritical temperature of the isostructural phase transition, there appears a continuous maximum in the field dependence of the entropy.

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5

WENG, ZHENG-YU. "PHASE STRING THEORY FOR DOPED ANTIFERROMAGNETS." International Journal of Modern Physics B 21, no. 06 (March 10, 2007): 773–827. http://dx.doi.org/10.1142/s0217979207036722.

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The recent developments of the phase string theory for doped antiferromagnets will be briefly reviewed. Such theory is built upon a singular phase string effect induced by the motion of holes in a doped antiferromagnet, which as a precise property of the t-J model dictates the novel competition between the charge and spin degrees of freedom. A global phase diagram including the antiferromagnetic, superconducting, lower and upper pseudogap, and high-temperature "normal" phases, as well as a series of anomalous physical properties of these phases will be presented as the self-consistent and systematic consequences of the phase string theory.

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6

Soh, Yeong-Ah, and Ravi K. Kummamuru. "Spintronics in antiferromagnets." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, no. 1951 (September 28, 2011): 3646–57. http://dx.doi.org/10.1098/rsta.2011.0186.

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Magnetic domains and the walls between are the subject of great interest because of the role they play in determining the electrical properties of ferromagnetic materials and as a means of manipulating electron spin in spintronic devices. However, much less attention has been paid to these effects in antiferromagnets, primarily because there is less awareness of their existence in antiferromagnets, and in addition they are hard to probe since they exhibit no net magnetic moment. In this paper, we discuss the electrical properties of chromium, which is the only elemental antiferromagnet and how they depend on the subtle arrangement of the antiferromagnetically ordered spins. X-ray measurement of the modulation wavevector Q of the incommensurate antiferromagnetic spin-density wave shows thermal hysteresis, with the corresponding wavelength being larger during cooling than during warming. The thermal hysteresis in the Q vector is accompanied with a thermal hysteresis in both the longitudinal and Hall resistivity. During cooling, we measure a larger longitudinal and Hall resistivity compared with when warming, which indicates that a larger wavelength at a given temperature corresponds to a smaller carrier density or equivalently a larger antiferromagnetic ordering parameter compared to a smaller wavelength. This shows that the arrangement of the antiferromagnetic spins directly influences the transport properties. In thin films, the sign of the thermal hysteresis for Q is the same as in thick films, but a distinct aspect is that Q is quantized.

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7

Coileáin, Cormac Ó., and Han Chun Wu. "Materials, Devices and Spin Transfer Torque in Antiferromagnetic Spintronics: A Concise Review." SPIN 07, no. 03 (September 2017): 1740014. http://dx.doi.org/10.1142/s2010324717400148.

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From historical obscurity, antiferromagnets are recently enjoying revived interest, as antiferromagnetic (AFM) materials may allow the continued reduction in size of spintronic devices. They have the benefit of being insensitive to parasitic external magnetic fields, while displaying high read/write speeds, and thus poised to become an integral part of the next generation of logical devices and memory. They are currently employed to preserve the magnetoresistive qualities of some ferromagnetic based giant or tunnel magnetoresistance systems. However, the question remains how the magnetic states of an antiferromagnet can be efficiently manipulated and detected. Here, we reflect on AFM materials for their use in spintronics, in particular, newly recognized antiferromagnet Mn2Au with its in-plane anisotropy and tetragonal structure and high Néel temperature. These attributes make it one of the most promising candidates for AFM spintronics thus far with the possibility of architectures freed from the need for ferromagnetic (FM) elements. Here, we discuss its potential for use in ferromagnet-free spintronic devices.

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8

Migachev, S. A., M. F. Sadykov, M. M. Shakirzyanov, and D. A. Ivanov. "Antiferromagnetic Conic Refraction of Sound in Hematite." Solid State Phenomena 168-169 (December 2010): 173–76. http://dx.doi.org/10.4028/www.scientific.net/ssp.168-169.173.

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In a trigonal easy-plane -Fe2O3 antiferromagnet magnetic-field-dependent conic refraction due to the renormalization of the coefficients of elasticity effective magnetoelastic interaction is experimentally found in addition to the conventional internal conic refraction of the transverse elastic waves propagating along the trigonal C3 axis. It is shown that the deflection angle () of the energy flow from the C3 axis upon the internal conic refraction does not depend on the value of the magnetic field applied in the basis plane (HC3) and is a constant value determined by the correlation of the C14 and C44 coefficients of elasticity. The deflection angle of the energy flow upon the antiferromagnetic conic refraction () increases with increase in the field and tends to the  value at large H values. The obtained results agree well with the theory of this phenomenon in antiferromagnets and support its conclusions.

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9

Clark, Judith, Chongin Pak, Huibo Cao, and Michael Shatruk. "Helimagnetism in MnBi2Se4 Driven by Spin-Frustrating Interactions Between Antiferromagnetic Chains." Crystals 11, no. 3 (February 27, 2021): 242. http://dx.doi.org/10.3390/cryst11030242.

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We report the magnetic properties and magnetic structure determination for a linear-chain antiferromagnet, MnBi2Se4. The crystal structure of this material contains chains of edge-sharing MnSe6 octahedra separated by Bi atoms. The magnetic behavior is dominated by intrachain antiferromagnetic (AFM) interactions, as demonstrated by the negative Weiss constant of −74 K obtained by the Curie–Weiss fit of the paramagnetic susceptibility measured along the easy-axis magnetization direction. The relative shift of adjacent chains by one-half of the chain period causes spin frustration due to interchain AFM coupling, which leads to AFM ordering at TN = 15 K. Neutron diffraction studies reveal that the AFM ordered state exhibits an incommensurate helimagnetic structure with the propagation vector k = (0, 0.356, 0). The Mn moments are arranged perpendicular to the chain propagation direction (the crystallographic b axis), and the turn angle around the helix is 128°. The magnetic properties of MnBi2Se4 are discussed in comparison to other linear-chain antiferromagnets based on ternary mixed-metal halides and chalcogenides.

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10

CAPRIOTTI, LUCA. "QUANTUM EFFECTS AND BROKEN SYMMETRIES IN FRUSTRATED ANTIFERROMAGNETS." International Journal of Modern Physics B 15, no. 12 (May 20, 2001): 1799–842. http://dx.doi.org/10.1142/s0217979201004605.

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We investigate the interplay between frustration and zero-point quantum fluctuations in the ground state of the triangular and J1–J2 Heisenberg antiferromagnets, using finite-size spin-wave theory, exact diagonalization, and quantum Monte Carlo methods. In the triangular Heisenberg antiferromagnet, by performing a systematic size-scaling analysis, we have obtained strong evidences for a gapless spectrum and a finite value of the thermodynamic order parameter, thus confirming the existence of long-range Néel order. The good agreement between the finite-size spin-wave results and the exact and quantum Monte Carlo data also supports the reliability of the spin-wave expansion to describe both the ground state and the low-energy spin excitations of the triangular Heisenberg antiferromagnet. In the J1–J2 Heisenberg model, our results indicate the opening of a finite gap in the thermodynamic excitation spectrum at J2/J1≃0.4, marking the melting of the antiferromagnetic Néel order and the onset of a non-magnetic ground state. In order to characterize the nature of the latter quantum-disordered phase we have computed the susceptibilities for the most important crystal symmetry breaking operators. In the ordered phase the effectiveness of the spin-wave theory in reproducing the low-energy excitation spectrum suggests that the uniform spin susceptibility of the model is very close to the linear spin-wave prediction.

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11

Ślęzak, M., P. Dróżdż, W. Janus, H. Nayyef, A. Kozioł-Rachwał, M. Szpytma, M. Zając, et al. "Correction: Fine tuning of ferromagnet/antiferromagnet interface magnetic anisotropy for field-free switching of antiferromagnetic spins." Nanoscale 12, no. 37 (2020): 19477. http://dx.doi.org/10.1039/d0nr90207a.

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Correction for ‘Fine tuning of ferromagnet/antiferromagnet interface magnetic anisotropy for field-free switching of antiferromagnetic spins’ by M. Ślęzak et al., Nanoscale, 2020, DOI: 10.1039/d0nr04193a.

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12

Zhang, Ying, Wenhui Wang, Meng Huang, Ping Liu, Guojing Hu, Chao Feng, Xueyan Lei, et al. "MnPS3 spin-flop transition-induced anomalous Hall effect in graphite flake via van der Waals proximity coupling." Nanoscale 12, no. 45 (2020): 23266–73. http://dx.doi.org/10.1039/d0nr05314g.

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Detection of the antiferromagnetic (AFM) state is an important issue for the application of two-dimensional (2D) antiferromagnets in spintronics, and interfacial exchange coupling is a highly efficient means to detect AFM order.

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13

Huminiuc, Teodor, Oliver Whear, Andrew J. Vick, David C. Lloyd, Gonzalo Vallejo-Fernandez, Kevin O’Grady, and Atsufumi Hirohata. "Growth and Characterisation of Antiferromagnetic Ni2MnAl Heusler Alloy Films." Magnetochemistry 7, no. 9 (September 13, 2021): 127. http://dx.doi.org/10.3390/magnetochemistry7090127.

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Recent rapid advancement in antiferromagnetic spintronics paves a new path for efficient computing with THz operation. To date, major studies have been performed with conventional metallic, e.g., Ir-Mn and Pt-Mn, and semiconducting, e.g., CuMnAs, antiferromagnets, which may suffer from their elemental criticality and high resistivity. In order to resolve these obstacles, new antiferromagnetic films are under intense development for device operation above room temperature. Here, we report the structural and magnetic properties of an antiferromagnetic Ni2MnAl Heusler alloy with and without Fe and Co doping in thin film form, which has significant potential for device applications.

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14

IZYUMOV, Y. A., and V. M. LAPTEV. "COEXISTENCE OF SUPERCONDUCTIVITY AND ANTIFERROMAGNETISM." International Journal of Modern Physics B 05, no. 04 (February 20, 1991): 563–645. http://dx.doi.org/10.1142/s0217979291000341.

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An overview of the theoretical work on the problem of the influence of the antiferromagnetic ordering of localized spins on the superconducting state is provided. Effects of the exchange interaction of electrons with localized spins, are investigated. Separate treatment is given to the electron-magnon part of this interaction. The electron-magnon contribution is shown to affect both the singlet and triplet pairings. For different antiferromagnets — a collinear antiferromagnetic structure and a simple spiral structure — we investigate in detail the effect of the electron spectrum exchange readjustment due to the magnetic structure and analyse the relation of this effect to superconductivity. The influence of nonmagnetic impurities on the superconducting transition temperature in antiferromagnets is also noted. The entire treatment is carried out in terms of a unified approach of strong-coupling theory, by invoking the use of Eliashberg equations.

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15

Wang, Jian, Shinji Muraishi, Ji Shi, and Yoshio Nakamura. "Antiferromagnetic Layer Thickness Dependence of Exchange Bias in Sputter-Deposited Co/CoO/Co Trilayer." Materials Science Forum 675-677 (February 2011): 1263–66. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.1263.

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We have used ferromagnet/antiferromagnet/ferromagnet sandwich structure to probe the antiferromagnetic layer thickness dependence of exchange bias in sputter-deposited Co/CoO/Co trilayer. The exchange coupling occurring at the upper ferromagnetic/antiferromagnetic interface is always found to be stronger than the one at the lower antiferromagnetic/ferromagnetic interface. The grain growth with increasing antiferromagnetic layer thickness can lead to a gradient of grain size distribution through the whole antiferromagnetic layer. Consequently, the relatively large grains at the upper interface would results in a rougher interface which we treat as structural defects and can significantly enhance exchange bias through domain state model. The slightly decrease of exchange coupling with increasing antiferromgnetic layer thickness indicates that the exchange bias is only governed by the grains that are thermally stable but whose anisotropy energy is low enough to be set.

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16

Kosaka, Wataru, Masahisa Itoh, and Hitoshi Miyasaka. "Metamagnetism with TN = 97 K in a layered assembly of paddlewheel [Ru2] units and TCNQ: an empirical rule for interlayer distances determining the magnetic ground state." Materials Chemistry Frontiers 2, no. 3 (2018): 497–504. http://dx.doi.org/10.1039/c7qm00534b.

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A new layered antiferromagnet was synthesized from the reaction of a paddlewheel diruthenium(ii,ii) complex with a TCNQ derivative. The complex has a short interlayer distance and forms part of a series of layered antiferromagnets.

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17

Wang, Jiao-Yang, Qian Yang, Yi-Quan Zhang, Guang-Bo Che, Jiong-Peng Zhao, and Fu-Chen Liu. "Two isomorphous azide/formate Mn(ii) coordination polymers show spin-canted antiferromagnetism only in the formate system." Inorganic Chemistry Frontiers 5, no. 3 (2018): 719–22. http://dx.doi.org/10.1039/c7qi00789b.

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We reported two isomorphous azide/formate Mn^II complexes: the azide complex had normal antiferromagnetic coupling, while a canted antiferromagnet with a Néel temperature of T_N = 38.5 K was obtained in the formate system.

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18

YAKUBO, KOUSUKE, TAKAMICHI TERAO, and TSUNEYOSHI NAKAYAMA. "ANTIFERROMAGNETIC FRACTON AND ITS SPECTRAL DIMENSION." Fractals 01, no. 04 (December 1993): 881–86. http://dx.doi.org/10.1142/s0218348x93000915.

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The spectral dimensions of spin-wave fractons in percolating antiferromagnets are investigated in terms of a dynamic scaling argument and numerical simulations. It is found, by the scaling argument, that the value of the spectral dimension [Formula: see text] of antiferromagnetic fractons should be less than unity for any Euclidean dimensions d(≥2). Simulated results of [Formula: see text] for d=2, 3 and 4 percolating antiferromagnets indicate that [Formula: see text] are very close to unity independent of Euclidean dimension d.

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19

Vallejo-Fernandez, Gonzalo, and Markus Meinert. "Recent Developments on MnN for Spintronic Applications." Magnetochemistry 7, no. 8 (August 11, 2021): 116. http://dx.doi.org/10.3390/magnetochemistry7080116.

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There is significant interest worldwide to identify new antiferromagnetic materials suitable for device applications. Key requirements for such materials are: relatively high magnetocrystalline anisotropy constant, low cost, high corrosion resistance and the ability to induce a large exchange bias, i.e., loop shift, when grown adjacent to a ferromagnetic layer. In this article, a review of recent developments on the novel antiferromagnetic material MnN is presented. This material shows potential as a replacement for the commonly used antiferromagnet of choice, i.e., IrMn. Although the results so far look promising, further work is required for the optimization of this material.

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20

Сафин, А. Р., Е. Е. Козлова, Д. В. Калябин, and С. А. Никитов. "Детектирование терагерцевых электромагнитных волн с помощью проводящих антиферромагнетиков." Письма в журнал технической физики 47, no. 16 (2021): 20. http://dx.doi.org/10.21883/pjtf.2021.16.51323.18840.

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We investigate a mathematical model of a terahertz electromagnetic wave detector based on a conducting antiferromagnet and a heavy metal. The mechanism of resonant straightening of oscillations is based on the inverse spin Hall effect in a heavy metal under spin pumping from an antiferromagnet. It is shown that the frequency dependence of the constant voltage of the detector has a resonant character with a peak corresponding to the frequency of antiferromagnetic resonance. The sensitivity to an alternating terahertz signal of the proposed detector structure is comparable to the sensitivity of modern detectors based on Schottky and Gunn diodes.

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21

Джунь, И. О., Г. В. Бабайцев, М. Г. Козин, И. Л. Ромашкина, Е. И. Шанова, and Н. Г. Чеченин. "Влияние внешних факторов на ширину линии ферромагнитного резонанса в структурах с обменным смещением." Физика твердого тела 63, no. 6 (2021): 693. http://dx.doi.org/10.21883/ftt.2021.06.50924.185.

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Extrinsic factors contributing to the ferromagnetic resonance (FMR) line width in double layer (ferromagnet/antiferromagnet) systems with exchange bias were investigated. Dependence of the FMR line width on the thickness of the antiferromagnetic (AF) layer at a constant thickness of the ferromagnetic (F) layer and layers deposition order of the F - and AF - layers, as well as the correlation between the exchange bias and the surface roughness of the sample were studied. We found that the exchange bias has a minor, if any, contribution to the line width. In systems with an antiferromagnet deposited on a ferromagnetic layer, the width of the FMR line increases in proportion to the average size of the surface roughness. In systems with reversal layer sequence the uniaxial anisotropy provides a significant contribution to the line width. The width of the FMR line is in a quadratic dependence on the uniaxial anisotropy and inversely proportional to the thickness of the antiferromagnetic layer, which can be attributed to the effect of the microstructure evolution with the thickness as an extrinsic factor in the damping of the FMR.

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22

SISSON, CYNTHIA J. "CRITICAL DYNAMICS IN THE 3D SPIN-1/2 HEISENBERG MODEL: A DECOUPLED CELL MONTE CARLO STUDY." International Journal of Modern Physics C 07, no. 03 (June 1996): 441–47. http://dx.doi.org/10.1142/s0129183196000399.

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The three-dimensional spin-1/2 Heisenberg model on a simple cubic lattice is studied for ferromagnetic and antiferromagnetic interactions using the Decoupled Cell Method for quantum Monte Carlo. Results for the relaxation time τL are determined for both ferromagnetic and antiferromagnetic systems and found to be similar to those found for the classical (s → ∞) Heisenberg model. The scaling of τL with system size is used to extract the dynamical critical exponent z for the two systems. The values of z = 1.98 ± 0.12 for the ferromagnet and z = 1.94 ± 0.09 for the antiferromagnet are in good agreement with theoretical predictions and previous Monte Carlo studies of the classical Heisenberg model.

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23

SEMENOFF, GORDON W. "STRONG COUPLING QED BREAKS CHIRAL SYMMETRY." Modern Physics Letters A 07, no. 30 (September 28, 1992): 2811–18. http://dx.doi.org/10.1142/s0217732392004183.

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We show that the strong coupling limit of d-dimensional quantum electrodynamics with 2d/2[d/2] flavors of fermions can be mapped onto the s=1/2 quantum Heisenberg antiferromagnet in d–1 space dimensions. We use this mapping to prove that the strong coupling limit of QED breaks chiral symmetry. The staggered Néel order parameter of the antiferromagnet is the expectation value of a mass operator in QED and the spin-waves are pions. We speculate that the chiral symmetry breaking phase transition corresponds to a transition between the flux phase and the conventional Néel ordered phase of an antiferromagnetic t-J model.

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24

Minakov, A. A., I. V. Shvets, and V. G. Veselago. "Low temperature antiferromagnetic domains dynamics in helical antiferromagnets." Physica B: Condensed Matter 165-166 (August 1990): 243–44. http://dx.doi.org/10.1016/s0921-4526(90)80971-k.

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25

Minakov, A. A., I. V. Shvets, and V. G. Veselago. "Magnetostriction and antiferromagnetic domains dynamics in helical antiferromagnets." Journal of Magnetism and Magnetic Materials 88, no. 1-2 (July 1990): 121–33. http://dx.doi.org/10.1016/s0304-8853(97)90022-6.

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26

IOFFE, L. B., and A. I. LARKIN. "EFFECTIVE ACTION OF A TWO-DIMENSIONAL ANTIFERROMAGNET." International Journal of Modern Physics B 02, no. 02 (April 1988): 203–19. http://dx.doi.org/10.1142/s0217979288000160.

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In the limit of weak quantum fluctuations an effective long-wave action of the Heisenberg quantum antiferromagnet is obtained which allows one to get a spectrum, spin, and statistics of long-wave fluctuations. In the vicinity of the point of instability of an antiferromagnetic state quantum fluctuations result (at zero temperature as well) in a paramagnetic phase of a spin liquid.

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27

Mukhin, A. A., M. Biberacher, A. Pimenov, and A. Loidl. "Antiferromagnetic resonances and magnetization of a canted antiferromagnet." Journal of Magnetic Resonance 170, no. 1 (September 2004): 8–14. http://dx.doi.org/10.1016/j.jmr.2004.05.019.

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28

Vaidya, Priyanka, Sophie A. Morley, Johan van Tol, Yan Liu, Ran Cheng, Arne Brataas, David Lederman, and Enrique del Barco. "Subterahertz spin pumping from an insulating antiferromagnet." Science 368, no. 6487 (April 9, 2020): 160–65. http://dx.doi.org/10.1126/science.aaz4247.

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Spin-transfer torque and spin Hall effects combined with their reciprocal phenomena, spin pumping and inverse spin Hall effects (ISHEs), enable the reading and control of magnetic moments in spintronics. The direct observation of these effects remains elusive in antiferromagnetic-based devices. We report subterahertz spin pumping at the interface of the uniaxial insulating antiferromagnet manganese difluoride and platinum. The measured ISHE voltage arising from spin-charge conversion in the platinum layer depends on the chirality of the dynamical modes of the antiferromagnet, which is selectively excited and modulated by the handedness of the circularly polarized subterahertz irradiation. Our results open the door to the controlled generation of coherent, pure spin currents at terahertz frequencies.

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29

Okabayashi, Akira, and Takao Morinari. "Anisotropic diffusion of conduction electron under antiferromagnetic spin configuration." International Journal of Modern Physics B 30, no. 31 (December 5, 2016): 1650226. http://dx.doi.org/10.1142/s021797921650226x.

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We consider a conduction electron that couples with the localized spins, which are close to the antiferromagnetic ordered state. We show that the hopping of the conduction electron is possible even if the neighboring spins are almost antiparallel, and the difference in the relative angles between the neighboring spins leads to anisotropic diffusion of the conduction electron. Our calculation supports the presence of the spinmotive force in antiferromagnets.

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30

GOLINELLI, O., Th JOLICOEUR, and R. LACAZE. "HEISENBERG ANTIFERROMAGNETIC CHAIN of SPIN S=1." International Journal of Modern Physics C 05, no. 02 (April 1994): 259–61. http://dx.doi.org/10.1142/s0129183194000271.

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The Heisenberg antiferromagnetic chain of spin 1 with the most general single ion anisotropy is numerically analyzed. Chains of length up to 22 sites are studied by a Lanczös method and up to 32 sites with a quantum Monte Carlo. Gaps, magnetic excitations, dynamical properties and magnetic field behaviour are obtained. The recent neutron scattering experiments on the quasi one-dimensional antiferromagnet NENP are fully explained by our results.

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31

Zimmermann, Iwan, Reinhard K. Kremer, Shichao Hu, and Mats Johnsson. "Synthesis, crystal structure and magnetic properties of a new copper oxo-antimony sulphate CuSb6O8(SO4)2." Dalton Transactions 45, no. 1 (2016): 392–96. http://dx.doi.org/10.1039/c5dt04157k.

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The crystal structure of the new compound CuSb₆O₈(SO₄)₂ is made up of charge neutral layers with long antimony oxygen distances present in between the layers. CuSb₆O₈(SO₄)₂ constitutes a linear chain S = 1/2 Heisenberg antiferromagnet (J ∼ 2.8 K) which undergoes long-range antiferromagnetic ordering at 0.69 K.

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32

Legrand, William, Davide Maccariello, Fernando Ajejas, Sophie Collin, Aymeric Vecchiola, Karim Bouzehouane, Nicolas Reyren, Vincent Cros, and Albert Fert. "Room-temperature stabilization of antiferromagnetic skyrmions in synthetic antiferromagnets." Nature Materials 19, no. 1 (September 2, 2019): 34–42. http://dx.doi.org/10.1038/s41563-019-0468-3.

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33

Sergeeva, G. G. "Underdoped cuprate antiferromagnet as a two-dimensional antiferromagnetic metal." Low Temperature Physics 31, no. 12 (December 2005): 1040–42. http://dx.doi.org/10.1063/1.2144455.

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34

KWEK, L. C., and M. K. KWAN. "BERRY PHASE IN MAGNETOELECTRIC MATERIALS." International Journal of Quantum Information 07, supp01 (January 2009): 105–15. http://dx.doi.org/10.1142/s0219749909004761.

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Weak magnetism of antiferromagnetic crystals, such as MnCO3 , CoCO3 , and spin arrangement in antiferromagnets of low symmetry can be studied using the Dzyaloshinskii-Moriya (DM) interaction. Such interactions may also be present sometimes in some spin-chain systems like magnetoelectric multiferroics. These materials could in principle be prime candidates for solid state NMR quantum computing based on manipulation of geometric phases. However, recent preliminary studies appear to show that a small presence of DM interaction could dampen magnitudes of the geometric phases.

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35

Kubota, Takahide, Yusuke Shimada, Tomoki Tsuchiya, Tomoki Yoshikawa, Keita Ito, Yukiharu Takeda, Yuji Saitoh, Toyohiko Konno, Akio Kimura, and Koki Takanashi. "Microstructures and Interface Magnetic Moments in Mn2VAl/Fe Layered Films Showing Exchange Bias." Nanomaterials 11, no. 7 (June 30, 2021): 1723. http://dx.doi.org/10.3390/nano11071723.

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Heusler alloys are a material class exhibiting various magnetic properties, including antiferromagnetism. A typical application of antiferromagnets is exchange bias that is a shift of the magnetization curve observed in a layered structure consisting of antiferromagnetic and ferromagnetic films. In this study, a layered sample consisting of a Heusler alloy, Mn2VAl and a ferromagnet, Fe, is selected as a material system exhibiting exchange bias. Although the fully ordered Mn2VAl is known as a ferrimagnet, with an optimum fabrication condition for the Mn2VAl layer, the Mn2VAl/Fe layered structure exhibits exchange bias. The appearance of the antiferromagnetic property in the Mn2VAl is remarkable; however, the details have been unclear. To clarify the microscopic aspects on the crystal structures and magnetic moments around the Mn2VAl/Fe interface, cross-sectional scanning transmission electron microscope (STEM) observation, and synchrotron soft X-ray magnetic circular dichroism (XMCD) measurements were employed. The high-angle annular dark-field STEM images demonstrated clusters of Mn2VAl with the L21 phase distributed only around the interface to the Fe layer in the sample showing the exchange bias. Furthermore, antiferromagnetic coupling between the Mn- and Fe-moments were observed in element-specific hysteresis loops measured using the XMCD. The locally ordered L21 phase and antiferromagnetic Mn-moments in the Mn2VAl were suggested as important factors for the exchange bias.

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Kim, Woo Jin, Taekoo Oh, Jeongkeun Song, Eun Kyo Ko, Yangyang Li, Junsik Mun, Bongju Kim, et al. "Strain engineering of the magnetic multipole moments and anomalous Hall effect in pyrochlore iridate thin films." Science Advances 6, no. 29 (July 2020): eabb1539. http://dx.doi.org/10.1126/sciadv.abb1539.

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The recent observation of the anomalous Hall effect (AHE) without notable magnetization in antiferromagnets has suggested that ferromagnetic ordering is not a necessary condition. Thus, recent theoretical studies have proposed that higher-rank magnetic multipoles formed by clusters of spins (cluster multipoles) can generate the AHE without magnetization. Despite such an intriguing proposal, controlling the unconventional AHE by inducing these cluster multipoles has not been investigated. Here, we demonstrate that strain can manipulate the hidden Berry curvature effect by inducing the higher-rank cluster multipoles in spin-orbit–coupled antiferromagnets. Observing the large AHE on fully strained antiferromagnetic Nd2Ir2O7 thin films, we prove that strain-induced cluster T1-octupoles are the only source of observed AHE. Our results provide a previously unidentified pathway for generating the unconventional AHE via strain-induced magnetic structures and establish a platform for exploring undiscovered topological phenomena via strain in correlated materials.

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SU, GANG, HUAIZHONG XING, DESHENG XUE, ZIYU CHEN, and FASHEN LI. "ONE-DIMENSIONAL SPIN-ONE HEISENBERG ANTIFERROMAGNET WITH SINGLE-ION ANISOTROPY IN A MAGNETIC FIELD: SCHWINGER BOSON THEORY." International Journal of Modern Physics B 14, no. 24 (September 30, 2000): 2561–75. http://dx.doi.org/10.1142/s0217979200002259.

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The one-dimensional spin-one Heisenberg antiferromagnet with single-ion anisotropy in the presence of the applied magnetic field is explored in terms of the Schwinger boson mean-field theory. The temperature and anisotropy dependences of the specific heat, the susceptibility and the magnetization are thoroughly discussed. New features of the specific heat as a function of temperature as well as anisotropy are found. A transition from an antiferromagnetic phase to a spin-canting phase is observed, and meanwhile, a schematic phase diagram is proposed.

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Гришин, С. В., М. Д. Амельченко, Ю. П. Шараевский, and С. А. Никитов. "Дважды отрицательные среды на основе антиферромагнитных метаматериалов для терагерцевого диапазона частот." Письма в журнал технической физики 47, no. 18 (2021): 32. http://dx.doi.org/10.21883/pjtf.2021.18.51470.18873.

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The paper presents the theoretical study results of the dispersion characteristics of electromagnet-ic waves existing in antiferromagnetic (AFM) metamaterial. The AFM metamaterial consists of a transversely magnetized antiferromagnet, inside of which a two-dimensional periodic structure of thin conducting wires surrounded by insulators is placed. It has been established that the AFM metamaterial has two frequency ranges, in which there are backward waves, and the material pa-rameters of the medium are twice negative. The indicated areas are located in the terahertz range.

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Lan, Da, Binbin Chen, Lili Qu, Kexuan Zhang, Liqiang Xu, Feng Jin, Zhuang Guo, Feng Chen, Guanyin Gao, and Wenbin Wu. "Tuning antiferromagnetic interlayer exchange coupling in La0.67Ca0.33MnO3-based synthetic antiferromagnets." APL Materials 7, no. 3 (March 2019): 031119. http://dx.doi.org/10.1063/1.5087570.

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RICHTER, J., R. DARRADI, R. ZINKE, and R. F. BISHOP. "FRUSTRATED QUANTUM ANTIFERROMAGNETS: APPLICATION OF HIGH-ORDER COUPLED CLUSTER METHOD." International Journal of Modern Physics B 21, no. 13n14 (May 30, 2007): 2273–88. http://dx.doi.org/10.1142/s0217979207043658.

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We report on recent results for strongly frustrated quantum J1 - J2 antiferromagnets in dimensionality d = 1, 2, 3 obtained by the coupled cluster method (CCM). We demonstrate that the CCM in high orders of approximation allows us to investigate quantum phase transitions driven by frustration and to discuss novel quantum ground states. In detail we consider the ground-state properties of (i) the Heisenberg spin-1/2 antiferromagnet on the cubic lattice in d = 1, 2, 3, and use the results for the energy, the sublattice magnetization and the spin stiffness as a benchmark test for the precision of the method; (ii) coupled frustrated spin chains (the quasi-one-dimensional J1 - J2 model) and discuss the influence of the quantum fluctuations and the interchain coupling on the incommensurate spiral state present in the classical model; (iii) the Shastry-Sutherland antiferromagnet on the square lattice; and (iv) a stacked frustrated square-lattice Heisenberg antiferromagnet (the quasi-two-dimensional J1 - J2 model), and discuss the influence of the interlayer coupling on the quantum paramagnetic ground-state phase that is present for the strictly two-dimensional model.

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Southern, B. W., and A. Peles. "Topological phase transitions in frustrated magnets." Canadian Journal of Physics 84, no. 6-7 (January 15, 2006): 517–22. http://dx.doi.org/10.1139/p06-014.

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The role of topological excitations in frustrated Heisenberg antiferromagnets between two and three spatial dimensions is considered. In particular, the antiferromagnetic Heisenberg model on a stacked triangular geometry with a finite number of layers is studied using Monte Carlo methods. A phase transition that is purely topological in nature occurs at a finite temperature for all film thicknesses. The results indicate that topological excitations are important for a complete understanding of the critical properties of the model between two and three dimensions. PACS Nos.: 75.10.Hk, 75.40.Cx, 75.40.Mg

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SONG, YUN. "LOCAL MODES AROUND THE FERROMAGNETIC IMPURITIES IN THE TWO-DIMENSIONAL HEISENBERG ANTIFERROMAGNETS." Modern Physics Letters B 15, no. 08 (April 10, 2001): 243–51. http://dx.doi.org/10.1142/s0217984901001720.

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The behaviors of the spin-wave excitations around the ferromagnetic impurities in the two-dimensional spin-1/2 Heisenberg antiferromagnets are investigated for the cases with one, two and four impurities respectively. By means of the double-time Green's function numerical procedure, it is found that, in the two impurity case, two ferromagnetic impurities prefer to form an effective singlet. While in the four impurity case we obtained that, two nearest-neighbor ferromagnetic domains with contrary spin directions are formed in the antiferromagnetic background, and thus the whole system has the lowest energy.

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Zhang, D. L., X. G. Xu, Y. Wu, X. Q. Li, J. Miao, and Y. Jiang. "Enhanced antiferromagnetic coupling in dual-synthetic antiferromagnet with Co2FeAl electrodes." Journal of Magnetism and Magnetic Materials 324, no. 10 (May 2012): 1822–25. http://dx.doi.org/10.1016/j.jmmm.2012.01.008.

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44

Sharmin, S., I. Umegaki, H. Tanaka, T. Ono, G. Tanaka, H. Nojiri, M. Fujisawa, et al. "Antiferromagnetic resonance modes for theS= 1/2 kagome antiferromagnet Cs2Cu3SnF12." Journal of Physics: Conference Series 302 (July 20, 2011): 012011. http://dx.doi.org/10.1088/1742-6596/302/1/012011.

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45

Yao, Xiaoyan. "Partially disordered antiferromagnetic state in two-dimensional triangular-lattice antiferromagnet." Physics Letters A 374, no. 6 (January 2010): 886–90. http://dx.doi.org/10.1016/j.physleta.2009.12.001.

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46

Sizanov, A. V., and A. V. Syromyatnikov. "Antiferromagnet with two coupled antiferromagnetic sublattices in a magnetic field." Journal of Physics: Condensed Matter 23, no. 14 (March 22, 2011): 146002. http://dx.doi.org/10.1088/0953-8984/23/14/146002.

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47

Glazkov, V., T. Soldatov, and Yu Krasnikova. "Numeric Calculation of Antiferromagnetic Resonance Frequencies for the Noncollinear Antiferromagnet." Applied Magnetic Resonance 47, no. 10 (August 27, 2016): 1069–80. http://dx.doi.org/10.1007/s00723-016-0825-1.

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48

Сафин, А. Р., П. А. Попов, Д. В. Калябин, and С. А. Никитов. "Синтезатор дискретной сетки частот на основе антиферромагнитного спинтронного осциллятора." Письма в журнал технической физики 46, no. 20 (2020): 23. http://dx.doi.org/10.21883/pjtf.2020.20.50151.18311.

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Dynamics of an antiferromagnetic spintronic oscillator phase-locked loop-based frequency synthesizer, which generates terahertz oscillations in a wide frequency range under the influence of direct current, was investigated. By the method of slowly varying amplitudes, a dependence of the gain on the ring of the phase locked loop on the difference in frequencies of synchronized oscillations at different division coefficients in the feedback circuit is obtained. It is shown that as the division coefficient increases, the band of synchronized oscillations decreases with unchanged parameters of the antiferromagnet-based spintronic oscillator.

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49

KAWAGUCHI, A., A. KOGA, N. KAWAKAMI, and K. OKUNISHI. "MAGNETIZATION CURVES OF QUASI-ONE-DIMENSIONAL HALDANE SYSTEMS." International Journal of Modern Physics B 16, no. 20n22 (August 30, 2002): 3339–42. http://dx.doi.org/10.1142/s021797920201436x.

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We study the magnetization process of a quasi-one-dimensional S=1 antiferromagnet with bond alternation by using the density matrix renormalization group method combined with interchain mean-field approximation. Particularly, we discuss how the interchain couplings affect the magnetization curve around a plateau structure in both of the Haldane phase and the dimer phase. It is shown that the antiferromagnetic correlation induced by the interchain couplings reduces the region of the plateau significantly, which will play an important role when the theoretical results are compared with actual measurements of the magnetization.

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CHEN, YONG-CONG. "OPTIMIZING THE RVB STATE ON A TRIANGULAR LATTICE: PRESENCE OF THE LONG RANGE ORDER." Modern Physics Letters B 08, no. 20 (August 30, 1994): 1253–60. http://dx.doi.org/10.1142/s0217984994001242.

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We present a Schwinger boson approach for the RVB state of the spin-1/2 Heisenberg antiferromagnet on a triangular lattice. It is shown that a Gutzwiller projection of the mean field state that includes both antiferromagnetic and ferromagnetic decouplings leads to optimizing the RVB pair amplitudes within a self-consistent approximation. The resulting state yields, by Monte Carlo simulations, energies and spin-spin correlations in excellent agreement with the exact diagonalization result on finite lattices (up to 36 sites). We conclude that the optimized RVB wave function possesses a long range three-sublattice order.

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