Spin-orbit torque tunes the damping of ferrimagnetic insular films

ORAL

Abstract

Magnonics offers a promising route for low-loss information transport and processing. Developing strategies to compensate for magnon damping is critical for applications such as magnon transistors and amplifiers. Here, we investigate the spin–orbit torque effect in ferrimagnetic insulating films of Li0.5Al1.0Fe1.5O4 (LAFO). A Pt bar is used to inject spins into the LAFO layer via the spin Hall effect. Subsequently, magnons are probed by Brillouin light scattering (BLS). We find that the magnon damping in LAFO can be completely compensated by anti-damping torque, as evidenced by a sudden enhancement of the BLS intensity with increasing current. Moreover, in addition to the ferromagnetic resonance mode, an auto-oscillation mode emerges when the current exceeds a critical value, whose frequency decreases with an increase in current.

*All authors gratefully acknowledge funding from the Center for Energy Efficient Magnonics, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences at SLAC National Laboratory under contract DE- AC02-76SF00515. J.Tong and X. Li also acknowledge partial support from the Welch Foundation Chair F-0014 for materials supply.

–

Presenters

  • Junwei Tong

    • The University of Texas at Austin

Authors

  • Junwei Tong

    • The University of Texas at Austin

  • Xiangcheng Liu

    • University of Texas at Austin

  • Lerato Takana

    • Stanford University

  • Katya Mikhailova

    • Stanford University

  • Yuri Suzuki

    • Stanford University

  • Xiaoqin Elaine Li

    • University of Texas at Austin