Journal
APPLIED PHYSICS LETTERS
Volume 100, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4717752
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Funding
- Office of Basic Energy Science, U.S. Department of Energy [DE FG03-87ER-45332]
- Spanish MICINN [MAT2009-08494]
- Basque Government [PI2011-1]
- European Commission [PIRG06-GA-2009-256470, PIRG07-GA-2010-268357]
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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]
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