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Influence of inverse spin Hall effect in spin-torque ferromagnetic resonance measurements

机译:逆自旋霍尔效应对自旋转矩铁磁共振测量的影响

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摘要

We have performed spectral analyses of spin-torque ferromagnetic resonance (ST-FMR) signals in both Ni_(80)Fe_(20)/Ta and Co_(40)Fe_(40)B_(20)/Ta bilayers and compared the spin Hall angles of these signals. We found that the contribution of the inverse spin Hall effect to the total signal in ST-FMR measurements is marked particularly in the case of Co_(40)Fe_(40)B_(20)/Ta bilayers, because the anisotropic magnetoresistance effect in Co_(40)Fe_(40)B_(20), i.e., the origin of the ST-FMR signal, is much smaller than that in Ni_(80)Fe_(20). When we take into account the contribution of the inverse spin Hall effect, the spin Hall angle of Co_(40)Fe_(40)B_(20)/Ta decreases to less than half of that estimated by conventional ST-FMR spectral analysis.
机译:我们已经对Ni_(80)Fe_(20)/ Ta和Co_(40)Fe_(40)B_(20)/ Ta双层中的自旋扭矩铁磁共振(ST-FMR)信号进行了频谱分析,并比较了自旋霍尔这些信号的角度。我们发现,在Co_(40)Fe_(40)B_(20)/ Ta双层的情况下,特别是在Co_(40)Fe_(40)B_(20)/ Ta双层的情况下,反自旋霍尔效应对总信号的贡献特别明显,因为Co_( (40)Fe_(40)B_(20),即ST-FMR信号的起源比Ni_(80)Fe_(20)中的要小得多。当我们考虑逆向自旋霍尔效应的贡献时,Co_(40)Fe_(40)B_(20)/ Ta的自旋霍尔角减小到小于常规ST-FMR谱分析估计的自旋霍尔角的一半。

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  • 来源
    《Applied physics express》 |2016年第2期|023002.1-023002.4|共4页
  • 作者单位

    Center of Emergent Matter Science, RIKEN, Wako, Saitama 351-0198, Japan;

    National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan;

    Center of Emergent Matter Science, RIKEN, Wako, Saitama 351-0198, Japan,National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan;

    National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan;

    Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan;

    Center of Emergent Matter Science, RIKEN, Wako, Saitama 351-0198, Japan,Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan;

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