2016

Phenomenology of chiral damping in noncentrosymmetric magnets

Phenomenology of chiral damping in noncentrosymmetric magnets
C.A. Akosa, I.M. Miron, G. Gaudin, A. Manchon
Phys. Rev. B 93, 214429 (2016)​
C.A. Akosa, I.M. Miron, G. Gaudin, A. Manchon
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2016
​A phenomenology of magnetic chiral damping is proposed in the context of magnetic materials lacking inversion symmetry. We show that the magnetic damping tensor acquires a component linear in magnetization gradient in the form of Lifshitz invariants. We propose different microscopic mechanisms that can produce such a damping in ferromagnetic metals, among which local spin pumping in the presence of an anomalous Hall effect and an effective “s-d” Dzyaloshinskii-Moriya antisymmetric exchange. The implication of this chiral damping in terms of domain-wall motion is investigated in the flow and creep regimes.​