Anomalous Nernst Effect in Epitaxial L10FePd1−xPtx Alloy Films: Berry Curvature and Thermal Spin Current
Anomalous Nernst Effect in Epitaxial L10FePd1−xPtx Alloy Films: Berry Curvature and Thermal Spin Current
复制标题
外延 L10FePd1-xPtx 合金薄膜中的反常能斯特效应：贝里曲率和热自旋电流
DOI：
10.1103/physrevapplied.13.054044
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发表时间：
2020
影响因子：
4.6
通讯作者：
Guang-Yu Guo
中科院分区：
文献类型：
--
作者：
Zhong Shi;Shi-Jie Xu;Li Ma;Shi-Ming Zhou;Guang-Yu Guo
对外延有序合金薄膜中的反常能斯特效应进行了系统的实验和理论研究。研究发现，反常能斯特系数和反常霍尔电阻率都随着成分的增加而单调增加。减去Seebeck贡献，得到反常能斯特电导率()。通过与第一性原理Berry相论计算的比较，有趣的是发现反常能斯特电导主要是由具有大的自旋-轨道耦合强度的重金属的本征贡献所决定的。此外，第一性原理计算还预测了有序和的大的自旋能级系数。因此，本研究结果对于寻找具有大的热驱动霍尔流和自旋流的材料具有一定的指导意义。
Anomalous Nernst effect in epitaxially grown-orderedalloy films is systematically investigated both experimentally and theoretically. It is found that the anomalous Nernst coefficient and anomalous Hall resistivity both increase monotonically with the increase ofcomposition. By subtracting the Seebeck contribution, the anomalous Nernst conductivity () is obtained. By comparison with first-principles Berry-phase-theory calculations, it is interesting to find that the anomalous Nernst conductivity is dominated by the intrinsic contribution from heavy metal-with large spin-orbit coupling strength. Moreover, the first-principles calculations also predict a large spin Nernst counductivity for both-orderedand. Thus, the present results may shed light in searching materials with large thermally driven Hall and spin currents.