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
More filters
Journal Article
Chirally coupled nanomagnets
Zhaochu Luo,Trong Phuong Dao,Aleš Hrabec,Jaianth Vijayakumar,Armin Kleibert,Manuel Baumgartner,Eugenie Kirk,Jizhai Cui,Tatiana Savchenko,Gunasheel Krishnaswamy,Laura J. Heyderman,Pietro Gambardella +11 more
TL;DR: In this article, the Dzyaloshinskii-Moriya interaction was used to realize lateral exchange bias, field-free current-induced switching between multistate magnetic configurations as well as synthetic antiferromagnets, skyrmions, and artificial spin ices covering a broad range of length scales and topologies.
Journal ArticleDOI
Ferroic states in La doped BiFeO3-PbTiO3 multiferroic compounds
Luiz Fernando Cótica,Flávia Regina Estrada,V. F. Freitas,G. S. Dias,Ivair A. Santos,José Antonio Eiras,Ducinei Garcia +6 more
TL;DR: In this article, the relationship between ferroic states and physicochemical mechanism which governs the (Bi/Pb/La)-O bonds in polycrystalline La doped (0.6)BiFeO3-(0.4)PbTiO3 compounds were investigated.
Journal ArticleDOI
Effect of rhombohedral to orthorhombic transition on magnetic and dielectric properties of La and Ti co-substituted BiFeO3
TL;DR: In this paper, a phase analysis of x-ray diffraction pattern by employing Rietveld technique was performed with the help of FULLPROF program which suggests the existence of compositional driven crystal structure transition from rhombohedral (space group R3c) to the orthorhombic (space groups Pbnm) symmetry.
Journal ArticleDOI
Mesoscopic antiferromagnets: statics, dynamics, and quantum tunneling (Review)
TL;DR: In this article, the static and dynamic, quantum and classical properties of antiferromagnets (AFMs) are discussed from a unified point of view, focusing mainly on mesoscopic magnets.
Journal ArticleDOI
Syntheses, Crystal Structures, and Magnetic Properties of Two Mn(II) Coordination Polymers Based on the 5-Aminotetrazole Ligand: Effect of Sources of Ligand on Construction of Topological Networks
Tian-Wei Wang,Dong-Sheng Liu,Dong-Sheng Liu,Dong-Sheng Liu,Chang-Cang Huang,Yan Sui,Yan Sui,Xi-He Huang,Jian-Zhong Chen,Xiao-Zeng You +9 more
TL;DR: Two new coordination polymers, [Mn15(atz)18(μ 3-OH)4(μ3-SO4)4]n·9nH2O (1) and [mn8(atz), 4(μ-OH), 4 (μ4-SO 4)4 (H 2O) 4 ) (atz = 5-aminotetrazolate), have been prepared by single-crystal X-ray diffraction studies, variable temperature (1.8−300 K) magnetic measurements, and thermal gravity analysis.