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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Interfacial oxygen-octahedral-tilting-driven electrically tunable topological Hall effect in ultrathin SrRuO3 films
Youdi Gu,Youdi Gu,Yi Wen Wei,Kun Xu,Hongrui Zhang,Fei Wang,Fei Wang,Fan Li,M. S. Saleem,Cui-Zu Chang,Jirong Sun,Cheng Song,Ji Feng,Ji Feng,Xiaoyan Zhong,Wei Liu,Zhidong Zhang,Jing Zhu,Feng Pan +18 more
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Interlayer Dzyaloshinskii-Moriya Interactions.
TL;DR: It is shown by means of atomistic calculations that in heterostructures an interlayer coupling of the Dzyaloshinskii-Moriya type across a spacer can emerge and this interaction yields nontrivial three-dimensional spin textures across the entire trilayer, which evolve within as well as between the planes and, hence, combine intraplane and interplane chiralities.
Journal ArticleDOI
The Experimentalist's Guide to the Cycloid, or Noncollinear Antiferromagnetism in Epitaxial BiFeO3.
TL;DR: An outlook on possible device applications exploiting noncollinear magnetism in Bi FeO3 films is presented, and it is hoped that this work will act as a comprehensive experimentalist's guide to the spin cycloid in BiFeO3 thin films.
Journal ArticleDOI
Disorder-induced phase coexistence in bulk doped manganites and its suppression in nanometer-sized crystals: The case ofLa0.9Ca0.1MnO3
E. Rozenberg,Alexander I. Shames,Mark Auslender,G. Jung,Israel Felner,Jaivardhan Sinha,S. S. Banerjee,D. Mogilyansky,E. Sominski,Aharon Gedanken,Ya. M. Mukovskii,G. Gorodetsky +11 more
Journal ArticleDOI
Influence of the cation distribution on the magnetization of Y-type hexagonal ferrites
TL;DR: In this article, a preferential occupation of Mg2+ and Co2+ ions of the inner octahedral sites of the T crystallographic block is explained for the peculiar magnetic order observed in Mg 2−Y.