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Title: Verification of the Thomson-Onsager reciprocity relation for spin caloritronics
Authors: Dejene, F.K.
Flipse, J.
van Wees, B.J.
Issue Date: 2014
Publisher: © American Physical Society
Citation: DEJENE, F.K., FLIPSE, J. and VAN WEES, B.J., 2014. Verification of the Thomson-Onsager reciprocity relation for spin caloritronics. Physical Review B, 90 (18), 180402(R).
Abstract: We investigate the Thomson-Onsager relation between the spin-dependent Seebeck and spin-dependent Peltier effect. To maintain identical device and measurement conditions we measure both effects in a single Ni80Fe20/Cu/Ni80Fe20 nanopillar spin valve device subjected to either an electrical or a thermal bias. In the low bias regime, we observe similar spin signals as well as background responses, as required by the Onsager reciprocity relation. However, at large biases, deviation from reciprocity occurs in the voltage-current relationships, dominated by nonlinear contributions of the temperature-dependent transport coefficients. By systematic modeling of these nonlinear thermoelectric effects and measuring higher-order thermoelectric responses for different applied biases, we identify the transition between the two regimes as the point at which Joule heating starts to dominate over Peltier heating. Our results signify the importance of local equilibrium (linearity) for the validity of this phenomenological reciprocity relation.
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.90.180402.
Sponsor: This work is part of the research program of the Foundation for Fundamental Research on Matter (FOM) and is supported by NanoLab NL, MACALO EU-FP7 ICT Grant No. 257159, InSpin EU-FP7-ICT Grant No. 612759, and the Zernike Institute for Advanced Materials.
Version: Accepted for publication
DOI: 10.1103/PhysRevB.90.180402
URI: https://dspace.lboro.ac.uk/2134/35294
Publisher Link: https://doi.org/10.1103/PhysRevB.90.180402
ISSN: 2469-9969
Appears in Collections:Published Articles (Physics)

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