Current Control of Magnetic Anisotropy via Strain in a CoFeB Waveguide

ORAL

Abstract

We demonstrate that in-plane charge current can effectively control the spin precession resonance in an Al$_{\mathrm{2}}$O$_{\mathrm{3}}$/CoFeB/Ta heterostructure. Brillouin Light Scattering (BLS) was used to detect the ferromagnetic resonance field under microwave excitation of spin waves at fixed frequencies. Such control originates from the modified in-plane uniaxial magnetic anisotropy field $H_{\mathrm{k}}$, which changes symmetrically with respect to the current direction. Numerical simulation suggests that the anisotropic stressintroduced by Joule heating plays an important role in controlling $H_{\mathrm{k}}$. The results provide new insights into current manipulation of magnetic properties and have broad implications on spintronic devices.

*This work is supported by SHINES, an Energy Frontier Research Center funded by the U.S. Department of Energy (DoE), Office of Science, Basic Energy Science (BES) under award # DE-SC0012670

–

Authors

  • Kyongmo An

    • Department of Physics, University of Texas, Austin, Texas 78712, USA

  • Xin Ma

    • Department of Physics, University of Texas, Austin, Texas 78712, USA

  • Chi-feng Pai

    • Cornell University, Ithaca, New york 14853, USA

  • Jusang Yang

    • Department of Physics, University of Texas, Austin, Texas 78712, USA

  • Kevin Olsson

    • Department of Physics, University of Texas, Austin, Texas 78712, USA

  • James Erskine

    • Department of Physics, University of Texas, Austin, Texas 78712, USA

  • Allan Macdonald

    • Department of Physics, University of Texas, Austin, Texas 78712, USA

  • Daniel Ralph

    • Cornell University, Ithaca, New york 14853, USA

  • Robert Buhrman

    • Cornell University, Ithaca, New york 14853, USA

  • Xiaoqin Li

    • Department of Physics, University of Texas, Austin, Texas 78712, USA