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arXiv · 2207.06842

Dzyaloshinskii-Moriya spin density by skew scattering

Adam B. Cahaya·Alejandro O. Leon
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Abstract

Anisotropic exchange couplings, such as the Dzyaloshinskii-Moriya interaction (DMI), have played a vital role in the formation and dynamics of spin textures. This work predicts an anisotropic conduction electron spin density in metals with heavy magnetic impurities. The polarization of this $Dzyaloshinskii$-$Moriya$ $spin$ $density$ (DM-SD) is not collinear to the localized magnetic moments but rotated by the spin-dependent skew scattering of heavy atoms. The DM-SD induces the DMI between magnetic moments in metals and, therefore, it is the anisotropic extension of the Rutherman-Kittel-Kasuya-Yoshida spin density. Our model consists of two localized magnetic moments, one with a large spin-orbit coupling (a lanthanide or rare earth), in a free electron gas. The lanthanide spin controls the DM-SD strength and polarization, promising a flexible control mechanism for anisotropic couplings.

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Adam B. Cahaya, Alejandro O. Leon. 2022-07-14. Dzyaloshinskii-Moriya spin density by skew scattering. https://doi.org/10.1103/physrevb.106.l100408

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