Colored thermal noise in spin valves

ORAL

Abstract

We report a theoretical study of the thermal electrical noise in spin valves. There are two independent noise sources in spin valves: 1) thermal agitation of charge carriers causing Johnson-Nyquist noise, 2) thermal agitation of the magnetization that contributes to the electric noise by spin and charge pumping. The noise power spectrum from the latter consists of two absorption lines at zero frequency and at the ferromagnetic resonance on top of a white noise background. The relative intensities depend on the magnetization configuration.

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Authors

  • Jiang Xiao

    • Kavli Institute of NanoScience, Delft University of Technology, Delft, The Netherlands

  • Gerrit Bauer

    • Delft University of Technology, Kavli Institute of NanoScience, Lorentzweg 1, 2628 CJ Delft, The Netherlands
    • Kavli Institute of NanoScience, Delft University of Technology, Delft, The Netherlands

  • Sadamichi Maekawa

    • Tohoku University; CREST-JST
    • Institute for Materials Physics, Tohoku University
    • Institute for Materials Research, Tohoku University
    • Institute for Materials Research, Tohoku University, Sendai, Japan

  • Arne Brataas

    • Norwegian University of Science and Technology, Department of Physics, NO-7491 Trondheim, Norway
    • Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway