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
Citations
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Journal ArticleDOI
Impulsive excitation of coherent magnons and phonons by subpicosecond laser pulses in the weak ferromagnet FeBO3
Alexandra M. Kalashnikova,Alexandra M. Kalashnikova,Alexey Kimel,Roman V. Pisarev,V. N. Gridnev,P. A. Usachev,Andrei Kirilyuk,Theo Rasing +7 more
TL;DR: In this article, it was shown that coherent magnons can be excited by both linearly and circularly polarized laser pulses where the efficiency of the process depends on the mutual orientation of the magnetic and crystallographic axes and the light propagation direction.
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Theory of helical spin crystals: Phases, textures, and properties
B. Binz,Ashvin Vishwanath +1 more
TL;DR: In this article, the properties of helical spin crystals were investigated and simple rules for stabilizing various spin crystal structures over single spirals were established, such as symmetry stabilized topological textures and missing Bragg reflections.
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Band theory for electronic and magnetic properties of
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Journal ArticleDOI
Novel 3-D PtS-like Tetrazolate-Bridged Manganese(II) Complex Exhibiting Spin-Canted Antiferromagnetism and Field-Induced Spin-Flop Transition
TL;DR: In this paper, two manganese(II) tetrazolate coordination polymers, Mn3(Hbta)4(μ2-OH)2(H2O)·2H 2O (1) and Mn(bta)(H 2 O) (2), were obtained by the hydrothermal reaction of MnCl2·4H2 O with N,N-bis[1(2)H-tetrazol-5-yl]amine (H2bta), in different pH values.
Journal ArticleDOI
Topological honeycomb magnon Hall effect: A calculation of thermal Hall conductivity of magnetic spin excitations
TL;DR: In this paper, a simple realization of the magnon Hall effect in a two-band model on the honeycomb lattice was proposed, and it was shown that the thermal Hall conductivity has a fixed sign for all parameter regimes considered.