Theory of Higher Order Spin Noise Spectrum and Its Measurement

ORAL

Abstract

Optical spin noise spectroscopy is a perturbation-free technique that enables one to characterize spin dynamics by detecting thermodynamic spin fluctuations via the Faraday or Kerr effect. However, most of the research has concentrated on the second-order spin noise correlator, i.e., the power spectrum, whereas higher-order correlators can also be measured and analyzed. Here, we theoretically show that the measurement of higher-order spin noise correlators can tell us more information about the physical system, such as the correlation effect, time-reversal symmetry breaking processes, and higher-order fluctuation dissipation theorems. These would be difficult to detect with other experimental techniques. We illustrate these ideas with experimental data on magnetization fluctuations in a ferromagnetic Pt/Co/Pt trilayer.

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Presenters

  • Fuxiang Li

    • Center for Nonlinear Studies, Los Alamos National Laboratory
    • Center for Nonlinear Studies and Theoretical Division, Los Alamos National Laboratory

Authors

  • Fuxiang Li

    • Center for Nonlinear Studies, Los Alamos National Laboratory
    • Center for Nonlinear Studies and Theoretical Division, Los Alamos National Laboratory

  • Nikolai Sinitsyn

    • Theoretical Division, Los Alamos National Laborary
    • Los Alamos National Laboratory
    • Theoretical Division, Los Alamos National Laboratory
    • Theoretical Division, Los Alamos National Lab

  • Andrew Balk

    • National High Magnetic Field Laboratory, Los Alamos National Laboratory
    • National High Magnetic Field Laboratory, Los Alamos National Lab

  • Scott Crooker

    • National High Magnetic Field Laboratory, Los Alamos National Laboratory
    • National High Magnetic Field Laboratory, Los Alamos National Lab
    • Los Alamos National Laboratory
    • NHMFL, Los Alamos National Laboratory