Spin Seebeck coefficients of Fe, Co, Ni, and Ni80Fe20 3d-metallic thin films

Spin Seebeck coefficients of Fe, Co, Ni, and Ni80Fe20 3d-metallic thin films
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Fe、Co、Ni 和 Ni80Fe20 3d 金属薄膜的自旋塞贝克系数

DOI:
10.1016/j.materresbull.2020.111153
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发表时间:
2021
影响因子:
5.4
通讯作者:
Xiao, John Q.
Xiao, John Q.
中科院分区:
材料科学2区
文献类型:
--
作者:
Yang, Dongchao;Yi, Lizhi;Fan, Shuaiwei;He, Xiaogang;Xu, Yunli;Liu, Min;Ding, Linjie;Pan, Liqing;Xiao, John Q.

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由于许多其他热电信号,包括反常能斯特效应 (ANE)、磁邻近感应 ANE 和 FM 中的逆自旋霍尔效应 (ISHE),定量确定铁磁金属 (FM) 的自旋塞贝克效应 (SSE) 是一项挑战。通过比较单层 FM 层和 FM/Pt 双层的热电信号以及模型辅助分析 FM 中的 ISHE 贡献,我们能够确定纯 SSE 信号以及 Fe、Co、Ni 和 Ni 80 Fe 20 在 90 至 300 K 温度范围内的自旋塞贝克系数。与 FM 态密度相关的自旋相关塞贝克系数 S↑ 和 S↓ 也通过结合传统的塞贝克系数和SSE系数。我们进一步建议 SSE 系数的计算应包括通过 S seq σ↑ S↑-σ↓ S↓ σ↑+ σ↓ 的自旋相关电导率。
It is challenge to quantitatively determine the spin Seebeck effect (SSE) of ferromagnetic metals (FM) due to many other thermoelectric signals including the anomalous Nernst effect (ANE), magnetic proximity-induced ANE, and inverse spin Hall effect (ISHE) in FM. By comparing the thermoelectric signals of single FM layer and FM/Pt bilayer and model-assisted analyses of ISHE contribution in FM, we are able to determine the pure SSE signals and the spin Seebeck coefficients of Fe, Co, Ni, and Ni 80 Fe 20 over a temperature range from 90 to 300 K. The spin-dependent Seebeck coefficients S↑ and S↓, which is related to the density of states of FM, were also determined experimentally by combining the conventional Seebeck coefficient and the SSE coefficient. We further suggest the calculation of the SSE coefficient should include the spin-dependent conductivities via S s≡ σ↑ S↑-σ↓ S↓ σ↑+ σ↓.
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