Real-time Detection of Magnetic Vortex Dynamics by Using Tunneling Magnetoresistance Effect

  • Kasai S.
    Institute for Chemical Research, Kyoto Univ.
  • Nakano K.
    Institute for Chemical Research, Kyoto Univ.
  • Kondou K.
    Institute for Chemical Research, Kyoto Univ.
  • Ohshima N.
    Device Platforms Research Laboratories, NEC Corp.
  • Kobayashi K.
    Institute for Chemical Research, Kyoto Univ.
  • Ono T.
    Institute for Chemical Research, Kyoto Univ.

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  • TMR効果を用いた磁気渦ダイナミクスの時間分解測定
  • TMR コウカ オ モチイタ ジキウズ ダイナミクス ノ ジカン ブンカイ ソクテイ

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Abstract

Magnetic vortex dynamics has been intensively studied because of its potential application to non-volatile and high-density magnetic random access memory. Here, we demonstrate that the magnetic vortex dynamics can be detected by using a magnetic tunnel junction (MTJ). The huge output of the MTJ allows us to detect the magnetic vortex dynamics not only in the frequency domain, but also in the real-time regime. In the high current-density regime, changes of the phase of the output signal have been detected, which suggest switching events of the polarity of the magnetic vortex core.

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