Self-consistent determination of spin Hall angle and spin diffusion length in Pt and Pd: The role of the interface spin loss.

Self-consistent determination of spin Hall angle and spin diffusion length in Pt and Pd: The role of the interface spin loss.
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Pt 和 Pd 中自旋霍尔角和自旋扩散长度的自洽测定:界面自旋损失的作用

DOI:
10.1126/sciadv.aat1670
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发表时间:
2018-06
期刊:
影响因子:
13.6
通讯作者:
Ding H
Ding H
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Tao X;Liu Q;Miao B;Yu R;Feng Z;Sun L;You B;Du J;Chen K;Zhang S;Zhang L;Yuan Z;Wu D;Ding H

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自旋泵激逆自旋霍尔效应自旋电荷转换关键参数的自洽确定。自旋霍尔角(θSH)和自旋扩散长度(λsd)是描述自旋-电荷转换的关键参数,是自旋电子学的重要组成部分。尽管其重要性和大量的努力,致力于量化它们,在相同的给定材料的报告值存在显着的不一致。本文报道了一种自洽的方法,通过不同的铁磁(FM)泵浦源的自旋泵浦来定量计算超导材料的θSH和λsd。我们使用(i)有效自旋混合电导,(ii)微波光电阻,和(iii)逆自旋霍尔效应测量来表征Pt和Pd与各种FM组合的自旋-电荷转换,并发现泵浦自旋电流遭受界面自旋损耗(ISL),其大小因不同的界面而异。通过对ISL效应的适当处理,我们得到了Pt和Pd的θSH和λsd的一致值,而与使用的铁磁体无关。
Self-consistent determination of the key parameters in spin-charge conversion via spin pumping–induced inverse spin Hall effect. Spin Hall angle (θSH) and spin diffusion length (λsd) are the key parameters in describing the spin-charge conversion, which is an integral part of spintronics. Despite their importance and much effort devoted to quantifying them, significant inconsistencies in the reported values for the same given material exist. We report a self-consistent method to quantify both θSH and λsd of nonmagnetic materials by spin pumping with various ferromagnetic (FM) pumping sources. We characterize the spin-charge conversion for Pt and Pd with various FM combinations using (i) effective spin-mixing conductance, (ii) microwave photoresistance, and (iii) inverse spin Hall effect measurements and find that the pumped spin current suffers an interfacial spin loss (ISL), whose magnitude varies for different interfaces. By properly treating the ISL effect, we obtained consistent values of θSH and λsd for both Pt and Pd regardless of the ferromagnet used.
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