Verification of the Thomson-Onsager reciprocity relation for spin caloritronics

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 Ni${}_{80}$Fe${}_{20}$/Cu/Ni${}_{80}$Fe${}_{20}$ 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 due to dominant nonlinear contribution 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 start to dominate over Peltier heating. Our results signify the importance of local equilibrium for the validity of this phenomenological reciprocity relation.

arXiv comment5 pages, 5 figures

References in corpus (14)

• Spin Caloritronics
• Thermally driven spin injection from a ferromagnet into a non-magnetic metal
• Seebeck Effect in Magnetic Tunnel Junctions
• Cooling and heating with electron spins: Observation of the spin Peltier effect
• Thermoelectric Effects in Magnetic Nanostructures
• Interplay of Peltier and Seebeck effects in nanoscale nonlocal spin valves
• Onsager Relations in Coupled Electric, Thermoelectric and Spin Transport: The Ten-Fold Way
• Spin-dependent Seebeck coefficients of Ni_{80}Fe_{20} and Co in nanopillar spin valves
• Spin heat accumulation and spin-dependent temperatures in nanopillar spin valves
• Spin-dependent Seebeck effect in non-local spin valve devices
• Non-linear spin Seebeck effect due to spin-charge interaction in graphene
• Thermal spin current and magnetothermopower by Seebeck spin tunneling
• Experimental verification of reciprocity relations in quantum thermoelectric transport
• Thermal spin transport and spin-orbit interaction in ferromagnetic/non-magnetic metals

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• Comparison of the magneto-Peltier and magneto-Seebeck effects in magnetic tunnel junctions
• Local and non-local thermopowers in three-terminal nanostructures
• Thermographic measurements of spin-current-induced temperature modulation in metallic bilayers
• Thermal Control of the Magnon-Photon Coupling in a Notch Filter coupled to a Yttrium-Iron-Garnet/Platinum System
• Experimental proof of the reciprocal relation between spin Peltier and spin Seebeck effects in a bulk YIG/Pt bilayer
• Thermal spin injection and interface insensitivity in permalloy/aluminum metallic non-local spin valves
• Thermal effects in spintronic materials and devices: an experimentalist's guide
• An alternative to the spin-coupled interface resistance for describing heat generation