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 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.

Original languageEnglish
Article number212401
JournalApplied Physics Letters
Volume100
Issue number21
DOIs
StatePublished - 21 May 2012

Bibliographical note

Funding Information:
We thank J. Bass and Y. V. Pershin for useful discussions. Work supported by the Office of Basic Energy Science, U.S. Department of Energy, under Grant No. DE FG03-87ER-45332. The authors acknowledge financial support from the Spanish MICINN (MAT2009-08494), the Basque Government (PI2011-1), and the European Commission (PIRG06-GA-2009-256470 and PIRG07-GA-2010-268357).

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