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arXiv · 1811.06112

Spin-dependent Seebeck effect in non-local spin valve devices

Mikhail Erekhinsky·Fèlix Casanova·Ivan K. Schuller·Amos Sharoni
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Abstract

We performed measurements of Py/Cu and Py/Ag lateral spin valves as 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.

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Mikhail Erekhinsky, Fèlix Casanova, Ivan K. Schuller, Amos Sharoni. 2018-11-14. Spin-dependent Seebeck effect in non-local spin valve devices. https://doi.org/10.1063/1.4717752

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