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
Fiber optics for spin waves
Xiangjun Xing,Yan Zhou +1 more
TL;DR: Xing et al. as discussed by the authors showed that deep one-dimensional potential wells can be created in chiral magnets, acting as magnonic waveguides that resemble optic fibres with a graded refractive index.
Journal ArticleDOI
Dzyaloshinskii-Moriya interactions and adiabatic magnetization dynamics in molecular magnets
TL;DR: In this article, the effects of the Dzyaloshinskii-Moriya interaction, the most plausible source for the energy-level repulsions that lead to adiabatic changes of the magnetization, are studied in detail.
Journal ArticleDOI
Magnetic hedgehog lattices in noncentrosymmetric metals
TL;DR: In this paper, the authors study the stability of the magnetic hedgehog lattice (HL) for an effective spin model with long-range interactions arising from the itinerant nature of electrons and find that the HLs are stabilized in the ground state at zero magnetic field by the synergetic effect of the antisymmetric exchange interactions generated by the spin-orbit coupling and the multiple-spin interactions.
Journal ArticleDOI
Large rotating field entropy change in ErFeO3 single crystal with angular distribution contribution
TL;DR: In this article, the rotating field entropy of ErFeO3 single-crystal in a temperature range of 3-40'K was reported, where the giant magnetic entropy change, ΔSM was observed near T = 6'K.
Journal ArticleDOI
Asymmetric skyrmion Hall effect in systems with a hybrid Dzyaloshinskii-Moriya interaction
TL;DR: In this paper, the current-induced dynamics of a skyrmion that is subject to both structural and bulk inversion asymmetry was examined, and it was shown that in systems with a hybrid DMI, the spin-orbit-torque-induced skyr mion Hall angle is asymmetric for the two different skyrnion polarities, even allowing one of them to be tuned to zero.