Current-induced noise and damping in nonuniform ferromagnets

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

研究成果: Article査読

41 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号140402
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
78
14
DOI
出版ステータスPublished - 2008 10月 10
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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