Current-driven magnetization reversal in a Rashba bulk ferromagnet

ORAL

Abstract

The Rashba effect is the spin band splitting due to broken inversion symmetry through spin-orbit coupling, typically observed at surface and interface. Recently, some noncentrosymmetryic crystals have been found to have the bulk Rashba bands that are larger than surface/interface ones. In Rashba systems the charge current generates the net spin accumulation, which is known as Rashba-Edelstein effect (REE), leading to the electrical manipulation of the magnetization. Although such a current-driven magnetization manipulation has so far been studied for surface or interface Rashba systems, REE in bulk Rashba bands may be efficient because the local magnetic moment is in contact with the accumulated spin moment of the conduction spin. Here, we observed current-driven magnetization reversal in Ge1-xMnxTe thin film, which is a bulk ferromagnetic Rashba semiconductor. The switching ratio of anomalous Hall resistivity does not decrease with the film thickness, indicating the spin accumulation stems not from the interface or surface but bulk Rashba spin splitting bands.

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Presenters

  • Ryutaro Yoshimi

    • RIKEN
    • RIKEN Center for Emergent Matter Science

Authors

  • Ryutaro Yoshimi

    • RIKEN
    • RIKEN Center for Emergent Matter Science

  • Kenji Yasuda

    • Univ of Tokyo

  • Atsushi Tsukazaki

    • Institute for Materials Reaserch, Tohoku University
    • Tohoku Univ
    • Institute for Materials Research, Tohoku University
    • IMR, Tohoku University
    • Institute for Materials Research
    • Tohoku University
    • Tohoku Univ.

  • Kei Takahashi

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

  • Masashi Kawasaki

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

  • Yoshinori Tokura

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