Quantitative Disentanglement of the Spin Seebeck, Proximity-Induced, and Ferromagnetic-Induced Anomalous Nernst Effect in Normal-Metal-Ferromagnet Bilayers.
Quantitative Disentanglement of the Spin Seebeck, Proximity-Induced, and Ferromagnetic-Induced Anomalous Nernst Effect in Normal-Metal-Ferromagnet Bilayers.
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DOI：
10.1103/physrevlett.119.227205
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发表时间：
2017-02
影响因子：
8.6
通讯作者：
P. Bougiatioti;C. Klewe;D. Meier;Orestis Manos;O. Kuschel;J. Wollschläger;L. Bouchenoire;Simon D. Brown;J. Schmalhorst;G. Reiss;T. Kuschel
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文献类型：
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作者：
P. Bougiatioti;C. Klewe;D. Meier;Orestis Manos;O. Kuschel;J. Wollschläger;L. Bouchenoire;Simon D. Brown;J. Schmalhorst;G. Reiss;T. Kuschel
我们发现并研究了Pt/NiFe_{2}O_{x}（4≥x≥0）双层膜中的热自旋输运现象。我们将自旋塞贝克效应产生的电压与反常能斯特效应（ANE）的贡献分开，甚至将铁磁体（FM）中的ANE与由于靠近FM而自旋极化的Pt产生的ANE解开。此外，我们还研究了从接近绝缘的NiFe_{2}O_{4}到金属Ni_{33}Fe_{67}的FM薄膜的电导率和带隙能量与这些效应的关系。与Pt/NiFe_{2}O_{x}（x>0）样品相比，只有在金属Pt/Ni_{33}Fe_{67}双层膜中才能观察到邻近诱导的ANE。这是通过X射线共振磁反射率的静态磁邻近效应的调查验证。
We identify and investigate thermal spin transport phenomena in sputter-deposited Pt/NiFe_{2}O_{x} (4≥x≥0) bilayers. We separate the voltage generated by the spin Seebeck effect from the anomalous Nernst effect (ANE) contributions and even disentangle the ANE in the ferromagnet (FM) from the ANE produced by the Pt that is spin polarized due to its proximity to the FM. Further, we probe the dependence of these effects on the electrical conductivity and the band gap energy of the FM film varying from nearly insulating NiFe_{2}O_{4} to metallic Ni_{33}Fe_{67}. A proximity-induced ANE could only be identified in the metallic Pt/Ni_{33}Fe_{67} bilayer in contrast to Pt/NiFe_{2}O_{x} (x>0) samples. This is verified by the investigation of static magnetic proximity effects via x-ray resonant magnetic reflectivity.