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
Tunable room-temperature magnetic skyrmions in Ir/Fe/Co/Pt multilayers
Anjan Soumyanarayanan,Anjan Soumyanarayanan,M. Raju,A. L. Gonzalez Oyarce,A. L. Gonzalez Oyarce,Anthony K. C. Tan,Anthony K. C. Tan,Mi-Young Im,Mi-Young Im,Alexander Paul Petrović,Pin Ho,Khoong Hong Khoo,Michael Tran,Chee Kwan Gan,F. Ernult,Christos Panagopoulos +15 more
TL;DR: This work presents a tunable RT skyrmion platform based on multilayer stacks of Ir/Fe/Co/Pt, which is established a platform for investigating functional sub-50-nm RTskyrmions, pointing towards the development of skyrMion-based memory devices.
Book ChapterDOI
Theory of Magnetic Exchange Interactions:Exchange in Insulators and Semiconductors
TL;DR: In this paper, the subject of exchange in magnetic materials is divided into two parts, referring to insulators and to metals, and a discussion and a diagrammatic classification of all the possible higher-order processes are given.
Journal ArticleDOI
Review on spintronics: Principles and device applications
Atsufumi Hirohata,Keisuke Yamada,Yoshinobu Nakatani,Lucian Prejbeanu,Bernard Dieny,Philipp Pirro,Burkard Hillebrands +6 more
TL;DR: In this paper, the spin degree of freedom of electrons and/or holes, which can also interact with their orbital moments, is described with respect to the spin generation methods as detailed in Sections 2-~-9.
Journal ArticleDOI
Domain-wall velocities of up to 750 m s −1 driven by exchange-coupling torque in synthetic antiferromagnets
TL;DR: It is shown that nanosecond-long current pulses can move domain walls in synthetic antiferromagnetic racetracks that have almost zero net magnetization, allowing for densely packed yet highly efficient domain-wall-based spintronics.