Influence of heat flow directions on Nernst effects in Py/Pt bilayers
Influence of heat flow directions on Nernst effects in Py/Pt bilayers
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DOI：
10.1103/physrevb.88.184425
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发表时间：
2013-11-25
影响因子：
3.7
通讯作者：
Reiss, G.
中科院分区：
文献类型：
--
作者：
Meier, D.;Reinhardt, D.;Reiss, G.
我们研究了在坡莫合金薄膜上的薄铂条中获得的电压，该薄膜受到面内温度梯度和磁场的作用。由细钨针尖或键合线检测到的电压相对于外部磁场呈现出纯对称效应，这可以完全由平面能斯特效应来解释。为了验证接触的影响，对在真空和大气中的测量进行了比较，得到了相似的结果。我们解释说，略微面内倾斜的温度梯度只会改变磁场方向的依赖性，但不会抵消所观察到的效应。此外，通过使用厚金针尖可以诱导出反常能斯特效应，该金针尖产生垂直于样品平面的热流。这种效应可以通过改变金针尖的温度来控制。我们讨论了这些测量结果与横向自旋塞贝克效应测量的相关性。
We investigated the voltages obtained in a thin Pt strip on a permalloy film which was subject to in-plane temperature gradients and magnetic fields. The voltages detected by thin W tips or bond wires showed a purely symmetric effect with respect to the external magnetic field which can be fully explained by the planar Nernst effect. To verify the influence of the contacts, measurements in vacuum and atmosphere were compared and gave similar results. We explain that a slightly in-plane tilted temperature gradient only shifts the field direction dependence but does not cancel out the observed effects. Additionally, the anomalous Nernst effect could be induced by using thick Au tips which generated a heat current perpendicular to the sample plane. The effect can be manipulated by varying the temperature of the Au tips. These measurements are discussed concerning their relevance in transverse spin Seebeck effect measurements.