Large-tunneling anisotropic magneto-Seebeck effect in a CoPt/MgO/Pt tunnel junction
Large-tunneling anisotropic magneto-Seebeck effect in a CoPt/MgO/Pt tunnel junction
复制标题
CoPt/MgO/Pt 隧道结中的大隧道各向异性磁塞贝克效应
DOI：
10.1103/physrevb.90.140406
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发表时间：
2014
影响因子：
3.7
通讯作者：
Amin V
中科院分区：
文献类型：
--
作者：
Amin V
利用相干输运计算，从理论上研究了实际模拟隧道结中隧穿各向异性磁塞贝克效应。为了比较，我们还研究了隧道磁塞贝克效应。我们发现，在室温下，磁塞贝克比超过了小势垒宽度下的磁塞贝克比。这与磁阻形成了鲜明的对比，磁阻在所有势垒宽度上的表现都比磁阻好一个数量级。因此，通过从两个铁磁层切换到一个铁磁层（这样自旋轨道耦合单独控制磁输运各向异性），磁阻比减小，而磁塞贝克比保持相当或显著提高。因此，我们证明了当仅由自旋轨道耦合引起时，磁性可调性会增加。这一结果揭示了自旋轨道耦合在隧道结的磁性调谐中所起的作用。
We theoretically investigate the tunneling anisotropic magneto-Seebeck effect in a realistically modeledtunnel junction using coherent transport calculations. For comparison we study the tunneling magneto-Seebeck effect inas well. We find that the magneto-Seebeck ratio ofexceeds that offor small barrier widths, reachingat room temperature. This provides a sharp contrast to the magnetoresistance, in whichperforms better by one order of magnitude for all barrier widths. Thus, by switching from two ferromagnetic layers to one (so that spin-orbit coupling alone governs the magnetic transport anisotropy), the magnetoresistance ratio diminishes while the magneto-Seebeck ratio remains comparable or improves considerably. We therefore demonstrate that magnetic tunability can increase when caused solely by spin-orbit coupling. This result sheds light on the role that spin-orbit coupling plays in magnetically tuning the properties of tunnel junctions.