Phenomenological model for size-dependent switching behavior in spin transfer torque devices

ORAL

Abstract

Recent results based on time resolved x-ray imaging of magnetization dynamics in nano-magnetic devices have shown size dependent trends in the switching behavior. Samples with a lateral dimension of 100x180nm show a vortex-driven switching mechanism, whereas smaller samples with a lateral dimension of 110x150nm do not switch by a vortex. Further studies have shown that when a non-zero angle in introduced between the fixed and the free layers, vortex-driven switching becomes manifest in samples with smaller dimensions also. Here, we would like to present a phenomenological model based on linearlized LLG equations to explain the various regimes of observed switching behaviors.

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Authors

  • Venkatesh Chembrolu

    • Stanford University
    • Department of Applied Physics, Stanford University, Stanford, California 94305, USA

  • Yves Acremann

    • PULSE Centre, Stanford Linear Accelerator Centre, Menlo Park, California 94025, USA

  • John Paul Strachan

    • Department of Applied Physics, Stanford University, Stanford, California 94305, USA

  • Xiaowei Yu

    • Department of Applied Physics, Stanford University, Stanford, California 94305, USA

  • Ashwin Tulapurkar

    • Stanford Synchrotron Radiation Laboratory, Menlo Park, California, 94025, USA

  • Jordan Katine

    • Hitachi Global Storage Technologies San Jose Research Center, San Jose, California 95120, USA

  • Mathew Carey

    • Hitachi Global Storage Technologies San Jose Research Center, San Jose, California 95120, USA

  • Tolek Tyliszczak

    • Advanced Light Source, Berkeley, California, 94720

  • Joachim Stohr

    • Stanford Synchrotron Radiation Laboratory, Menlo Park, California 94025, USA