利用太赫兹探针识别各向异性磁电阻的本征和非本征机制
Identifying intrinsic and extrinsic mechanisms of anisotropic magnetoresistance with terahertz probes
摘要：
确定自旋轨道耦合系统中磁输运的内在和外在起源一直是凝聚态物理的中心主题。然而，由于缺乏适当的实验工具，这一点一直难以捉摸。在这项工作中，使用太赫兹时域光谱，我们毫不含糊地解开的各向异性磁电阻（AMR）的坡莫合金薄膜的内在和外在的贡献。我们发现，散射无关的固有贡献AMR是相当大的，是一样大的散射依赖的外在贡献AMR。此外，由于非本征贡献的减少，总AMR的本征贡献的部分随着温度的升高而增加。进一步的研究表明，非本征贡献的减少是由声子/磁振子诱导的负AMR引起的。我们的研究结果将激发对其他自旋-轨道相互作用诱导现象的进一步研究，其中识别内在和外在贡献是重要的。
英文摘要：
Identifying the intrinsic and extrinsic origins of magneto-transport in spin-orbit coupled systems has long been a central theme in condensed matter physics. However, it has been elusive owing to the lack of an appropriate experimental tool. In this work, using terahertz time-domain spectroscopy, we unambiguously disentangle the intrinsic and extrinsic contributions to the anisotropic magnetoresistance (AMR) of a permalloy film. We find that the scattering-independent intrinsic contribution to AMR is sizable and is as large as the scattering-dependent extrinsic contribution to AMR. Moreover, the portion of intrinsic contribution to total AMR increases with increasing temperature due to the reduction of extrinsic contribution. Further investigation reveals that the reduction of extrinsic contribution is caused by the phonon/magnon-induced negative AMR. Our result will stimulate further researches on other spin-orbit-interaction-induced phenomena for which identifying the intrinsic and extrinsic contributions is important.
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