AC current-driven magnetization switching and nonlinear Hall rectification in a magnetic topological insulator

ORAL

Abstract

Spin-orbit torque arising from the surface states of topological insulators enables efficient current-induced control of magnetization. In this presentation, we demonstrate alternating-current (AC) driven magnetization reversal in a semi-magnetic topological insulator (Cr,Bi,Sb)2Te3/(Bi,Sb)2Te3, facilitated by a low threshold current density of 1.5x10^9 A/m^2. Time-domain Hall voltage measurements using an oscilloscope reveal a strongly nonlinear Hall response during the magnetization reversal process. Fourier analysis of the time-varying Hall voltage identifies higher-harmonic signals and a rectified direct-current (DC) component, highlighting the complex interplay among the applied current, external magnetic field, and magnetization dynamics. Furthermore, the hysteretic current-voltage characteristics gives rise to frequency mixing under dual-frequency excitation. This effect, distinct from conventional polynomial-based nonlinearities, allows for selective extraction of specific frequency components. Our results demonstrate that AC-driven switching produces tunable nonlinear responses, offering a new pathway for multifunctional spintronic devices with potential applications in energy-efficient memory, signal processing, and frequency conversion.

*This work was supported by JSPS KAKENHI Grant Nos. JP22H04958, JP23H05431 and JP24K16986, and JST PRESTO Grant No. JPMJPR23HA.

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Publication: Y. Kiyonaga, M. Mogi, R. Yoshimi, Y. Fujishiro, Y. Suzuki, M. T. Birch, A. Tsukazaki, M. Kawamura, M. Kawasaki and Y. Tokura, "AC Current-Driven Magnetization Switching and Nonlinear Hall Rectification in a Magnetic Topological Insulator", Advanced Materials, in press

Presenters

  • Yuto Kiyonaga

    • The University of Tokyo

Authors

  • Yuto Kiyonaga

    • The University of Tokyo

  • Masataka Mogi

    • University of Tokyo
    • The University of Tokyo

  • Ryutaro Yoshimi

    • Department of Advanced Materials Science, The University of Tokyo
    • The University of Tokyo
    • RIKEN

  • Yukako Fujishiro

    • RIKEN

  • Yuri Suzuki

    • The University of Tokyo

  • Max T Birch

    • RIKEN Center for Emergent Matter Science
    • RIKEN
    • RIKEN, CEMS

  • Atsushi Tsukazaki

    • Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), The University of Tokyo
    • The University of Tokyo
    • University of Tokyo

  • Minoru Kawamura

    • RIKEN Center for Emergent Matter Science (CEMS)
    • RIKEN

  • Masashi Kawasaki

    • Univ of Tokyo, RIKEN CEMS
    • University of Tokyo
    • RIKEN Center for Emergent Matter Science (CEMS), Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), The University of Tokyo
    • The University of Tokyo, RIKEN

  • Yoshinori Tokura

    • The University of Tokyo
    • Univ of Tokyo
    • RIKEN Center for Emergent Matter Science (CEMS), Tokyo College, the University of Tokyo
    • The University of Tokyo, RIKEN
    • University of Tokyo