Spin-dependent Seebeck effect in non-local spin valve devices
Spin-dependent Seebeck effect in non-local spin valve devices
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DOI：
10.1063/1.4717752
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发表时间：
2012-05-21
影响因子：
4
通讯作者：
Sharoni, Amos
中科院分区：
文献类型：
--
作者：
Erekhinsky, Mikhail;Casanova, Felix;Sharoni, Amos
我们测量了Py/Cu和Py/Ag横向自旋阀作为注入电流方向和大小的函数。在“临界”电流以上，自旋注入对电流方向的依赖性出乎意料。正电流比负电流表现出更高的自旋注入极化。这意味着除了电流诱导的自旋注入外，还有自旋相关的塞贝克效应引起的热诱导注入。由焦耳加热引起的Py电极的温度梯度是将多余的自旋注入非磁性通道的原因。这一效应对于理解大电流自旋器件（如自旋传递扭矩器件）具有重要意义。(C) 2012年美国物理研究所。[http://dx.doi.org/10.1063/1.4717752]
We performed measurements of Py/Cu and Py/Ag lateral spin valves as a function of injection current direction and magnitude. Above a "critical" current, there is an unexpected dependence of spin injection on current direction. Positive currents show higher polarization of spin injection than negative. This implies that in addition to current-induced spin injection, there is a thermally induced injection from a spin-dependent Seebeck effect. A temperature gradient in the Py electrode, caused by Joule heating, is responsible for injecting excess spins into the non-magnetic channel. This effect has important consequences for understanding high-current spin-based devices, such as spin transfer torque devices. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4717752]