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|Title: ||Spin-dependent Seebeck coefficients of Ni80Fe20 and Co in nanopillar spin valves|
|Authors: ||Dejene, F.K.|
van Wees, B.J.
|Issue Date: ||Jul-2012|
|Publisher: ||© American Physical Society|
|Citation: ||DEJENE, F.K., FLIPSE, J. and VAN WEES, B.J., 2012. Spin-dependent Seebeck coefficients of Ni80Fe20 and Co in nanopillar spin valves. Physical Review B, 86 (2), 024436.|
|Abstract: ||We have experimentally determined the spin-dependent Seebeck coefficient of permalloy (Ni80Fe20) and cobalt (Co) using nanopillar spin valve devices, a stack of two ferromagnetic layers separated by a nonmagnetic layer. The devices were specifically designed to separate heat-related effects from charge-related effects. A heat current, with no accompanying charge current, through the nanopillar spin valve leads to a thermovoltage proportional to the spin-dependent Seebeck coefficient SS = S↑ − S↓ of the ferromagnet, where S↑ and S↓ are the Seebeck coefficient for spin-up and spin-down electrons. By using a three-dimensional finite-element model based on spin-dependent thermoelectric theory, whose input material parameters were measured in separate devices, we
were able to accurately determine a spin-dependent Seebeck coefficient of −1.8 μV K−1 and −4.5 μV K−1 for cobalt and permalloy, respectively, corresponding to a Seebeck coefficient polarization PS = SS /SF of 0.08 and 0.25, where SF is the Seebeck coefficient of the ferromagnet. The results are in agreement with earlier theoretical work in Co/Cu multilayers and spin-dependent Seebeck and spin-dependent Peltier measurements in Ni80Fe20/Cu spin valve structures.|
|Description: ||This paper was published in the journal Physical Review B and the definitive published version is available at https://doi.org/10.1103/PhysRevB.86.024436.|
|Version: ||Accepted for publication|
|Publisher Link: ||https://doi.org/10.1103/PhysRevB.86.024436|
|Appears in Collections:||Published Articles (Physics)|
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