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}$.read more
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Journal ArticleDOI
Oxygen-enabled control of Dzyaloshinskii-Moriya Interaction in ultra-thin magnetic films.
TL;DR: It is demonstrated that the magnitude and sign of DMI can be entirely controlled by tuning the oxygen coverage of the magnetic film, therefore enabling the smart design of chiral magnetism in ultra-thin films and suggesting the possibility of electrical tuning of exotic magnetic phases.
Journal ArticleDOI
Do Images of Biskyrmions Show Type‐II Bubbles?
James Loudon,A. C. Twitchett-Harrison,David Cortés-Ortuño,M. T. Birch,L. A. Turnbull,Aleš Štefančič,Feodor Y. Ogrin,Erick Burgos-Parra,Nicholas Bukin,Angus Laurenson,Horia Popescu,Marijan Beg,Marijan Beg,Ondrej Hovorka,Hans Fangohr,Hans Fangohr,Paul A. Midgley,Geetha Balakrishnan,Peter D. Hatton +18 more
TL;DR: In this paper, quantitative Lorentz transmission electron microscopy, X-ray holography, and micromagnetic simulations are combined to search for biskyrmions in MnNiGa, a material in which they have been reported.
Journal ArticleDOI
Anisotropic field-induced ordering in the triangular-lattice quantum spin liquid NaYbSe 2
K. M. Ranjith,S. Luther,S. Luther,Thomas Reimann,Burkhard Schmidt,Ph. Schlender,Jörg Sichelschmidt,H. Yasuoka,André M. Strydom,Y. Skourski,J. Wosnitza,J. Wosnitza,H. Kühne,Th. Doert,Michael Baenitz +14 more
TL;DR: In this article, the authors derived the highly anisotropic magnetic phase diagram, which is discussed in comparison with the existing theoretical models for spin-$\frac{1}{2}$ triangular-lattice antiferromagnets.
Journal ArticleDOI
Velocity asymmetry of Dzyaloshinskii domain walls in the creep and flow regimes.
Marek Vaňatka,Juan-Carlos Rojas-Sánchez,Juan-Carlos Rojas-Sánchez,Jan Vogel,Jan Vogel,Marlio Bonfim,Mohamed Belmeguenai,Yves Roussigné,Andrey Stashkevich,André Thiaville,Stefania Pizzini,Stefania Pizzini +11 more
TL;DR: Measurements of domain wall dynamics in a Pt/Co/GdOx(t) wedge sample with perpendicular magnetic anisotropy find large values of the DMI, consistent in magnitude and sign with those obtained from Brillouin light scattering measurements.
Journal ArticleDOI
Controlling bimerons as skyrmion analogues by ferroelectric polarization in 2D van der Waals multiferroic heterostructures.
TL;DR: Reversible switch of the easy axis and the Curie temperature of the magnetic LaCl layer has been enabled by switching of ferroelectric polarization in In2Se3, and magnetic skyrmions in the bimerons form have been discovered and can be driven by an electric current.