Microscopic calculation of thermally induced spin-transfer torques

Hiroshi Kohno, Yuuki Hiraoka, Moosa Hatami, Gerrit E W Bauer

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)
12 Downloads (Pure)

Abstract

Spin-transfer torques, both reactive and dissipative, induced by temperature gradients in conducting ferromagnets are calculated microscopically for smooth magnetization textures. Temperature gradients are treated à la Luttinger by introducing a fictitious gravitational field that couples to the energy density. The thermal torque coefficients obtained by the Kubo formula contain unphysical terms that diverge towards zero temperature. Such terms are caused by equilibrium components and should be subtracted before applying the Einstein-Luttinger relation. Only by following this procedure a familiar Mott-like formula is obtained for the dissipative spin-transfer torque. The result indicates that a fictitious field that couples to the entropy rather than energy would solve the issue from the outset.

Original languageEnglish
Article number104417
Pages (from-to)1-12
Number of pages12
JournalPhysical Review B (Condensed Matter and Materials Physics)
Volume94
Issue number10
DOIs
Publication statusPublished - 15 Sep 2016

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