Detection of the spin current assisted effect using the giant magneto-resistance effect

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  • 巨大磁気抵抗効果を用いたスピン流アシスト効果の検出(ヘッド・スピントロニクス,一般)
  • 巨大磁気抵抗効果を用いたスピン流アシスト効果の検出
  • キョダイ ジキ テイコウ コウカ オ モチイタ スピンリュウ アシスト コウカ ノ ケンシュツ

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Abstract

We demonstrate a reduction of coercive field in Ni_<81>Fe_<19> films using a spin transfer torque generated by a spin pumping effect. When a microwave field resonates one of the ferromagnetic layer of a pseudo spin valve consisting of Ni_<81>Fe_<19> 100 nm/Cu 10 nm/Ni_<81>Fe_<19> 10 nm trilayer, a spin current is generated by the spin pumping effect. The spin current is injected to another ferromagnetic layer and the subsequent spin transfer torque can modulate the coercive field of the ferromagnetic layer. The coercive fields of two ferromagnetic layers are measured using the giant magneto-resistance (GMR) effect as a function of microwave frequency. From the frequency dependence of the coercive field, it is confirmed that the coercive field of Ni_<81>Fe_<19> 10 nm layer becomes minimum at the frequency where a ferromagnetic resonance is excited in another Ni_<81>Fe_<19> 100 nm layer. This is the clear evidence that the spin transfer torque generated by the spin pumping effect can assist the magnetization reversal of ferromagnetic thin film in the spin valve structure.

Journal

  • ITE Technical Report

    ITE Technical Report 39.37 (0), 7-10, 2015

    The Institute of Image Information and Television Engineers

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