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
Critical Behavior and Macroscopic Phase Diagram of the Monoaxial Chiral Helimagnet Cr 1/3 NbS 2 .
E. M. Clements,Raja Das,Ling Li,P. Lampen-Kelley,Manh-Huong Phan,Veerle Keppens,David Mandrus,Hariharan Srikanth +7 more
TL;DR: A comprehensive phase diagram based on detailed magnetization measurements of a high quality single crystal of Cr1/3NbS2 over three magnetic field regions is constructed, demonstrating for the first time the first-order nature of the onset of chiral ordering.
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Effective gauge field theory of spintronics
TL;DR: In this paper, the spin gauge field has adiabatic and nonadiabatic components, consisting an SU(2) gauge field, which gives rise to spin Berry's phase, topological Hall effect and spin motive force.
Journal ArticleDOI
Ferromagnetic-like behavior of Bi0.9La0.1FeO3-KBr nanocomposites
Dmitry V. Karpinsky,Olena Fesenko,Maxim V. Silibin,Maxim V. Silibin,S.V. Dubkov,Mykola Chaika,Andrii D. Yaremkevich,Anna Lukowiak,Yuriy Gerasymchuk,Wieslaw Strek,A. Pakalniškis,Ramunas Skaudzius,Aivaras Kareiva,Yevhen M. Fomichov,Vladimir V. Shvartsman,Sergei V. Kalinin,Nicholas V. Morozovsky,Anna N. Morozovska +17 more
TL;DR: In this paper, the magnetostatic response of the Bi0.9La0.1FeO3-KBr composites was studied and a ferromagnetic-like hysteresis loop with a remanent magnetization about 0.14 ǫemu/g and coercive field about 1.8 Tesla was observed.
Journal ArticleDOI
Mesoporous bismuth ferrite with amplified magnetoelectric coupling and electric field-induced ferrimagnetism
Thomas E. Quickel,Laura T. Schelhas,Richard A. Farrell,Nikolay Petkov,Van H. Le,Sarah H. Tolbert +5 more
TL;DR: The use of epitaxy-free wet chemical methods to create strained nanoporous BiFeO3 is reported, finding that the strained material shows large changes in saturation magnetization on application of an electric field, indicating that nanoscale architecture can complement strain-layer epitaxy as a tool to strain engineer magnetoelectric materials.
Journal ArticleDOI
Techniques in micromagnetic simulation and analysis
Dheeraj Kumar,A. O. Adeyeye +1 more