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Verification of the Thomson-Onsager reciprocity relation for spin caloritronics
journal contribution
posted on 2018-10-11, 15:05 authored by Fasil DejeneFasil Dejene, J. Flipse, B.J. van WeesWe 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.
Funding
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.
History
School
- Science
Department
- Physics
Published in
Physical Review BVolume
90Issue
18Citation
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).Publisher
© American Physical SocietyVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2014Notes
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.ISSN
2469-9969eISSN
2469-9950Publisher version
Language
- en