Current-induced noise and damping in nonuniform ferromagnets

Jørn Foros, Arne Brataas, Yaroslav Tserkovnyak, Gerrit E.W. Bauer

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

In the presence of spatial variation in the magnetization direction, electric current noise causes a fluctuating spin-transfer torque that increases the fluctuations of the ferromagnetic order parameter. By the fluctuation-dissipation theorem, the fluctuations at thermal equilibrium are related to the viscous magnetization damping, which in nonuniform ferromagnets acquires a nonlocal tensor structure. At the hand of spin spirals, we demonstrate that the current-induced noise and damping increase with the gradient of the magnetization texture and becomes significant for narrow domain walls.

Original languageEnglish
Article number140402
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number14
DOIs
Publication statusPublished - 2008 Oct 10
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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