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
Weak ferromagnetism with very large canting in a chiral lattice: Fe ( pyrimidine ) 2 Cl 2
R. Feyerherm,A. Loose,Takayuki Ishida,Takashi Nogami,J. Kreitlow,Dirk Baabe,F. J. Litterst,Stefan Süllow,Hans-Henning Klauss,Klaus Doll +9 more
TL;DR: The transition metal coordination compound (Fe) is a canted antiferromagnet with an unusually large canting of the magnetic moments of 14.5 degrees from their general Antiferromagnetic alignment, one of the largest reported to date as discussed by the authors.
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Study of magnetization reversal in LaCr1−xFexO3 compounds
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TL;DR: In this article, single phase samples of LaCr1−xFexO3 for x = 0-0.50 were prepared and their magnetic properties were studied to understand the magnetization reversal.
Journal ArticleDOI
Design of Two-Dimensional Multiferroics with Direct Polarization-Magnetization Coupling.
Junting Zhang,Xiaofan Shen,Yan-Cheng Wang,Chao Ji,Ying Zhou,Jianli Wang,Fengzhen Huang,Xiaomei Lu +7 more
TL;DR: This work demonstrates the magnetization reversal through switching polarization in a designed 2D multiferroic oxide by combining group theory analysis and first-principles calculation and shows that ferroelectricity can be induced by a specific octahedral rotation in a perovskite bilayer.
Journal ArticleDOI
Sr and Pb co-doping effect on the crystal structure, dielectric and magnetic properties of BiFeO3 multiferroic compounds
TL;DR: In this article, the influence of A-site Sr/Pb co-doping on the structure, dielectric and magnetic properties of BiFeO3 was investigated systematically.