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
Magnetic structure of the high-density single-valent e g Jahn-Teller system LaMn 7 O 12
A. Prodi,E. Gilioli,R. Cabassi,Fulvio Bolzoni,F. Licci,Qingzhen Huang,Jeffrey W. Lynn,Marco Affronte,Andrea Gauzzi,M. Marezio +9 more
TL;DR: In this article, the structural and physical properties of powder samples of the high-pressure LaMnO-7-O-12 compound were studied by means of neutron diffraction, dc magnetization, specific-heat, and dc electrical resistivity measurements.
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Role of direct exchange and Dzyaloshinskii-Moriya interactions in magnetic properties of graphene derivatives: C2F and C2H
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TL;DR: In this paper, the direct exchange interaction between spin orbitals in functionalized graphene has been investigated and shown to partially or even fully compensate the antiferromagnetic character of indirect exchange interactions.
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Experimental Evidence of Chiral Ferrimagnetism in Amorphous GdCo Films.
Robert Streubel,Charles-Henri Lambert,Noah Kent,Noah Kent,Peter Ercius,Alpha T. N'Diaye,Colin Ophus,Sayeef Salahuddin,Peter Fischer,Peter Fischer +9 more
TL;DR: Utilizing Lorentz microscopy and X-ray magnetic circular dichroism spectroscopy, and tailoring thickness, capping, and rare-earth composition, it is revealed that 2 nm thick GdCo films preserve ferrimagnetism and stabilize chiral domain walls.
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Paths to annihilation of first- and second-order (anti)skyrmions via (anti)meron nucleation on the frustrated square lattice
TL;DR: In this article, the authors studied the annihilation mechanism of small first-and second-order skyrmions and antiskyrms on the frustrated lattice with broken inversion symmetry.
Journal ArticleDOI
Bulk weak ferromagnet in ferrimagnetic chains of organic-inorganic hybrid materials based on BDH-TTP and paramagnetic thiocyanato complex anions: (BDH-TTP)[M(isoq)(2)(NCS)(4)], M = Cr(III), Fe(III).
Fatima Setifi,Stéphane Golhen,Lahcène Ouahab,Akira Miyazaki,K. Okabe,Toshiaki Enoki,Takashi Toita,Jun-ichi Yamada +7 more
TL;DR: ESR measurements show a single signal without separating the donor and anion spins, suggesting a pi interaction between the d and pi electrons, and these materials exhibit bulk canted weak ferromagnetism below 7.6 K for both 1 and 2.