Spin-Torque Shot Noise in Magnetic Tunnel Junctions

A. L. Chudnovskiy, J. Swiebodzinski, and A. Kamenev
Phys. Rev. Lett. 101, 066601 – Published 8 August 2008

Abstract

A spin polarized current may transfer angular momentum to a ferromagnet, resulting in a spin-torque phenomenon. At the same time the shot noise, associated with the current, leads to a nonequilibrium stochastic force acting on the ferromagnet. We derive a stochastic version of the Landau-Lifshitz-Gilbert equation for a magnetization of a “free” ferromagnetic layer in contact with a “fixed” ferromagnet. We solve the corresponding Fokker-Planck equation and show that the nonequilibrium noise yields to a nonmonotonic dependence of the precession spectrum linewidth on the current.

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  • Received 27 March 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.066601

©2008 American Physical Society

Authors & Affiliations

A. L. Chudnovskiy1, J. Swiebodzinski1, and A. Kamenev2

  • 1I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstrasse 9, D-20335 Hamburg, Germany
  • 2Department of Physics, University of Minnesota, Minneapolis, Minnesota 55455, USA

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Issue

Vol. 101, Iss. 6 — 8 August 2008

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