Intrinsic torques emerging from anomalous velocity in magnetic textures

Abstract

Momentum-space topology of electrons under strong spin-orbit coupling contributes to the electrically induced torques exerting on magnetic textures insensitively to disorder or thermal fluctuation. We present a direct connection between band topology and the torques by classifying the whole torques phenomenologically. As well as the intrinsic anomalous Hall effect, the torques also emerge intrinsically from the anomalous velocity of electrons regardless of a nonequilibrium transport current. We especially point out the intrinsic contribution arising exclusively in magnetic textures, which we call the "topological Hall torque (THT)." The THT emerges in bulk crystals without any interface or surface structures. We numerically demonstrate the enhancement of the THT in comparison with the conventional spin-transfer torque in the bulk metallic ferromagnet, which accounts for the giant current-induced torque measured in ferromagnetic SrRuO3.

7 pages, 2 figures, 1 table + 3 pages of supplemental material; resubmitted version

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Cited by in corpus (5)

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• Emergence of inductance and capacitance from topological electromagnetism
• Chiral gauge field in fully-spin polarized Weyl semimetal with magnetic domain walls
• Unraveling the dynamics of magnetization in topological insulator-ferromagnet heterostructures via spin-orbit torque