Journal ArticleDOI
Anisotropic Superexchange Interaction and Weak Ferromagnetism
TLDR
In this paper, the Anderson theory of superexchange was extended to include spin-orbit coupling and the antisymmetric spin coupling suggested by Dzialoshinski from purely symmetry grounds and the symmetric pseudodipolar interaction were derived.Abstract:
A theory of anisotropic superexchange interaction is developed by extending the Anderson theory of superexchange to include spin-orbit coupling. The antisymmetric spin coupling suggested by Dzialoshinski from purely symmetry grounds and the symmetric pseudodipolar interaction are derived. Their orders of magnitudes are estimated to be ($\frac{\ensuremath{\Delta}g}{g}$) and ${(\frac{\ensuremath{\Delta}g}{g})}^{2}$ times the isotropic superexchange energy, respectively. Higher order spin couplings are also discussed. As an example of antisymmetric spin coupling the case of Cu${\mathrm{Cl}}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O is illustrated. In Cu${\mathrm{Cl}}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O, a spin arrangement which is different from one accepted so far is proposed. This antisymmetric interaction is shown to be responsible for weak ferromagnetism in $\ensuremath{\alpha}$-${\mathrm{Fe}}_{2}$${\mathrm{O}}_{3}$, MnC${\mathrm{O}}_{3}$, and Cr${\mathrm{F}}_{3}$. The paramagnetic susceptibility perpendicular to the trigonal axis is expected to increase very sharply near the N\'eel temperature as the temperature is lowered, as was actually observed in Cr${\mathrm{F}}_{3}$.read more
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Journal ArticleDOI
Nonabelian magnonics in antiferromagnets
TL;DR: In this paper, the authors present a semiclassical formalism for antiferromagnetic (AFM) magnonics which promotes the central ingredient of spin wave chirality, encoded in a quantity called magnonic isospin, to a first-class citizen of the theory.
Journal ArticleDOI
Dielectric polarization measurements on the antiferromagnetic triangular lattice system CuFeO2 in pulsed high magnetic fields
Hiroyuki Mitamura,Setsuo Mitsuda,Shunsuke Kanetsuki,Hiroko Aruga Katori,Toshiro Sakakibara,Koichi Kindo +5 more
TL;DR: In this article, the dielectric polarization parallel to the direction of a single crystal of the triangular lattice antiferromagnet CuFeO 2 has been measured by a pyroelectric method in pulsed high magnetic fields.
Journal ArticleDOI
Degeneracies and fluctuations of Néel skyrmions in confined geometries
Rick Keesman,Andrey O. Leonov,P. van Dieten,Stefan Buhrandt,Gerard T. Barkema,Gerard T. Barkema,Lars Fritz,Rembert A. Duine +7 more
TL;DR: In this paper, Monte Carlo simulations were used to investigate the robustness of skyrmions against thermal fluctuations and finite-size effects in layered magnetic materials with Dzyaloshinskii-Moriya interactions.
Book ChapterDOI
Chapter 3 Compounds of transition elements with nonmetals
O. Beckman,L. Lundgren +1 more
TL;DR: In this paper, the authors discuss the compounds of transition elements with nonmetals and discuss the ferromagnetism of transition metal intermetallic compounds with non-metallic and semimetallic elements.
Journal ArticleDOI
Concurrence of Quantum Anomalous Hall and Topological Hall Effects in Magnetic Topological Insulator Sandwich Heterostructures
Jue Jiang,Di Xiao,Fei Wang,Jaeho Shin,Domenico Andreoli,Jianxiao Zhang,Run Xiao,Yifan Zhao,Morteza Kayyalha,Ling Zhang,Ke Wang,Jiadong Zang,Chao-Xing Liu,Nitin Samarth,Moses H. W. Chan,Cui-Zu Chang +15 more
TL;DR: In this paper, by inserting a TI layer between two magnetic TI layers to form a sandwich heterostructure, a concurrence of the topological Hall (TH) effect and the quantum anomalous Hall (QAH) effect through electric field gating was realized.