Spin-Transfer-Torque Driven Domain Wall Motion in (Ga,Mn)(As,P)

ORAL

Abstract

Precise control of domain wall (DW) motion in magnetic materials is a prerequisite for the realization of novel non-volatile and down-scalable logic/memory devices which promise to overcome the limitations of current technologies. While magnetic fields are the obvious choice for DW manipulation, in spin-orbit (SO) coupled materials, electric fields provide an additional means of control via current-induced spin torque. We extend the existing theoretical framework used to describe magnetization dynamics in uniform ferromagnets (FM) to dilute FM semiconductors. Analogous to the study of homogeneous systems, we compute the current-induced internal fields (CIF) corresponding to the spin torques and perform a quantitative analysis of the effect of CIFs on DW motion by solving the phenomenological Landau-Lifshitz-Gilbert equations. Microscopic calculations based on an accurate description of the SO coupling effects are used to estimate the observed anisotropies. Our theoretical efforts are complemented by experimental studies in the SO coupled FM (Ga,Mn)(As,P).

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Authors

  • E.K. Vehstedt

    • Dept of Physics \& Astronomy, Texas A\&M Uni; Inst of Physics, ASCR vvi

  • L.P. Zarbo

    • Institute of Physics ASCR, v.v.i., CZ
    • Inst of Physics, ASCR vvi

  • K. Vyborny

    • University at Buffalo, SUNY, NY and Academy of Sciences of the Czech Republic
    • Dept of Physics, SUNY Buffalo; Inst of Physics, ASCR vvi
    • Physics Dept., University at Buffalo, SUNY

  • E. De Ranieri

    • Hitatch-Cambridge Laboratory, Uni of Cambridge

  • H.G. Katzgraber

    • Department of Physics and Astronomy, Texas A\&M University and ETH Zurich
    • Department of Physics, Texas A\&M University \& ETH Zurich
    • Department of Physics \& Astronomy, Texas A\&M University, Department of Physics, ETH Zurich
    • Dept of Physics \& Astronomy, Texas A\&M Uni; ETH Zurich

  • J. Wunderlich

    • Hitachi Cambridge Laboratory, Cambridge CB3 0HE, UK; Institute of Physics ASCR, v.v.i., Cukrovarnick\'a 10, 162 53 Praha 6, Czech Republic
    • Hitachi Cambridge Laboratory
    • Hitatch-Cambridge Laboratory, Uni of Cambridge; Inst of Physics, ASCR vvi

  • T. Jungwirth

    • Institute of Physics ASCR, Prague and University of Nottingham
    • Institute of Physics ASCR
    • Inst of Physics, ASCR vvi; School of Physics \& Astronomy, Uni of Nottingham

  • J. Sinova

    • Department of Physics, Texas A\&M University
    • Texas A\&M University
    • Dept of Physics \& Astronomy, Texas A\&M Uni; Inst of Physics, ASCR vvi
    • Dept. of Physics, Texas A\&M Univ., College Station, TX