Spin superfluid junction oscillator

ORAL

Abstract

A spin oscillator is proposed based on a spin superfluid junction composed of two exchange coupled easy-plane ferromagnets. A spin chemical potential across the junction, with its spin polarization perpendicular to the easy-plane, can be established by driving electrical currents through two heavy metal contacts. When the spin chemical potential exceeds the threshold, it drives steady-state spin oscillation with a 2π precession angle, which can be electrically measured by the giant magnetoresistance, the anisotropic magnetoresistance, and the inverse spin Hall effect. The oscillation amplitude and frequency can be tuned via the applied D.C. current. An A.C. current applied to the heavy metal contacts, the spin oscillation also exhibits Shapiro steps, whose time-averaged component is fixed by the mode-locking. These features provide signatures for the experimental verification of spin superfluidity in easy-plane ferromagnets. This new type of spin nano-oscillator could serve as a device in a spintronic based neuromoprhic computing scheme.

*This work was supported as part of the Spins and Heat in Nanoscale Electronic Systems (SHINES) an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award #DE-SC0012670.

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Presenters

  • Yizhou Liu

    • Department of Electrical and Computer Engineering, University of California, Riverside
    • Electrical and Computer Engineering, University of California, Riverside

Authors

  • Yizhou Liu

    • Department of Electrical and Computer Engineering, University of California, Riverside
    • Electrical and Computer Engineering, University of California, Riverside

  • Igor Barsukov

    • Department of Physics and Astronomy, University of California, Riverside

  • Ilya Krivorotov

    • Univ of California - Irvine
    • Department of Physics and Astronomy, University of California, Irvine
    • Phyisics and Astronomy, Univ of California - Irvine
    • University of California, Irvine
    • Physics, Univ of California - Irvine

  • Yafis Barlas

    • Department of Physics and Astronomy, University of California, Riverside

  • Roger Lake

    • Electrical and computer Engineering, Univ of California - Riverside
    • Department of Electrical and Computer Engineering, University of California, Riverside
    • University of California, Riverside
    • Univ of California - Riverside
    • Electrical and Computer Engineering, University of California, Riverside
    • University of Califoria Riverside
    • University of California Riverside
    • Department of Electrical and Computer Engineering, Univ of California - Riverside
    • Electrical and Computer Engineering, University of California Riverside