Local Charge and Spin Currents in Magnetothermal Landscapes
Local Charge and Spin Currents in Magnetothermal Landscapes
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DOI：
10.1103/physrevlett.108.106602
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发表时间：
2012-03-05
影响因子：
8.6
通讯作者：
Goennenwein, Sebastian T. B.
中科院分区：
文献类型：
--
作者：
Weiler, Mathias;Althammer, Matthias;Goennenwein, Sebastian T. B.
可扫描激光束用于在金属（Co2FeAl）或绝缘（Y3Fe5O12）铁磁薄膜中产生局部热梯度。我们分别研究了由于反常能思特效应（ANE）和自旋塞贝克效应（SSE）而产生的局部电荷和自旋电流。在局部ANE实验中，我们检测了Co2FeAl薄膜平面上的电压作为激光光斑位置和外磁场大小和方向的函数。通过利用沉积在Y3Fe5O12上的Pt层中的逆自旋霍尔效应，以类似的方式检测到局部SSE效应。我们的发现建立了局部热自旋和电荷电流的产生以及自旋热电子域成像。
A scannable laser beam is used to generate local thermal gradients in metallic (Co2FeAl) or insulating (Y3Fe5O12) ferromagnetic thin films. We study the resulting local charge and spin currents that arise due to the anomalous Nernst effect (ANE) and the spin Seebeck effect (SSE), respectively. In the local ANE experiments, we detect the voltage in the Co2FeAl thin film plane as a function of the laser-spot position and external magnetic field magnitude and orientation. The local SSE effect is detected in a similar fashion by exploiting the inverse spin Hall effect in a Pt layer deposited on top of the Y3Fe5O12. Our findings establish local thermal spin and charge current generation as well as spin caloritronic domain imaging.