Spin-wave-induced spin torque in Rashba ferromagnets

Nobuyuki Umetsu, Daisuke Miura, Akimasa Sakuma

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We study the effects of Rashba spin-orbit coupling on the spin torque induced by spin waves, which are the plane-wave dynamics of magnetization. The spin torque is derived from linear-response theory, and we calculate the dynamic spin torque by considering the impurity-ladder-sum vertex corrections. This dynamic spin torque is divided into three terms: a damping term, a distortion term, and a correction term for the equation of motion. The distorting torque describes a phenomenon unique to the Rashba spin-orbit coupling system, where the distorted motion of magnetization precession is subjected to the anisotropic force from the Rashba coupling. The oscillation mode of the precession exhibits an elliptical trajectory, and the ellipticity depends on the strength of the nesting effects, which could be reduced by decreasing the electron lifetime.

Original languageEnglish
Article number174440
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number17
DOIs
Publication statusPublished - 2015 May 29

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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