High spin mixing conductance and spin interface transparency at the interface of a Co2Fe0.4Mn0.6Si Heusler alloy and Pt
High spin mixing conductance and spin interface transparency at the interface of a Co2Fe0.4Mn0.6Si Heusler alloy and Pt
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DOI：
10.1038/s41427-020-00268-7
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发表时间：
2021-01
影响因子：
9.7
通讯作者：
B. Singh;Koustuv Roy;P. Gupta;T. Seki;K. Takanashi;S. Bedanta
中科院分区：
文献类型：
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作者：
B. Singh;Koustuv Roy;P. Gupta;T. Seki;K. Takanashi;S. Bedanta
从自旋波的产生、传输和检测的角度来看，需要表现出低磁阻尼（α）和适度高饱和磁化强度的铁磁材料。由于自旋-电荷转换效率是另一个重要参数，因此高自旋混合电导是高效自旋-电荷转换的关键。全Heusler合金，例如，预计100%自旋极化的Co2Fe0.4Mn0.6Si（CFMS）表现出低α。然而，在CFMS和顺磁体之间的接口还没有完全理解。本文报道了CFMS/Pt双层膜中自旋抽运和逆自旋霍尔效应的研究。阻尼分析表明CFMS和Pt的界面处存在显著的自旋泵浦，这也被逆自旋霍尔电压的检测所证实。我们发现，CFMS/Pt中，（1.70 × 1020 m −2）和界面透明度（83%）高于其他铁磁/重金属系统的报道值。我们观察到的CFMS/Pt双层系统的自旋霍尔角为~0.026。
Ferromagnetic materials exhibiting low magnetic damping (α) and moderately high-saturation magnetization are required from the viewpoints of generation, transmission, and detection of spin waves. Since spin-to-charge conversion efficiency is another important parameter, high spin mixing conductanceis the key for efficient spin-to-charge conversion. Full Heusler alloys, e.g., Co2Fe0.4Mn0.6Si (CFMS), which are predicted to be 100% spin-polarized, exhibit lowα. However,at the interface between CFMS and a paramagnet is not fully understood. Here, we report investigations of spin pumping and the inverse spin Hall effect in CFMS/Pt bilayers. Damping analysis indicates the presence of significant spin pumping at the interface of CFMS and Pt, which is also confirmed by the detection of an inverse spin Hall voltage. We show that in CFMS/Pt,(1.70 × 1020m−2) and the interface transparency (83%) are higher than the values reported for other ferromagnetic/heavy metal systems. We observed a spin Hall angle of ~0.026 for the CFMS/Pt bilayer system.