Abstract
We verify for the first time the reciprocal relation between the spin Peltier and spin Seebeck effects in a bulk YIG/Pt bilayer. Both experiments are performed on the same YIG/Pt device by a setup able to accurately determine heat currents and to separate the spin Peltier heat from the Joule heat background. The sample-specific value for the characteristics of both effects measured on the present YIG/Pt bilayer is (6.2 ± 0.4) × 10−3 KA−1. In the paper we also discuss the relation of both effects with the intrinsic and extrinsic parameters of YIG and Pt and we envisage possible strategies to optimize spin Peltier refrigeration.
Highlights
The reciprocal relations of thermodynamics are a fundamental tool to analyze and understand the physics of transport phenomena[1]
The device is composed of a bulk yttrium iron garnet (YIG) parallelepiped with a thin film of Pt sputter deposited on one side
The microscopic and physical origin of the spin Peltier and of the spin Seebeck effects has been investigated in det ail[26,28,29,30,34,35,36,37,38,39,40,41,42,43]
Summary
The reciprocal relations of thermodynamics are a fundamental tool to analyze and understand the physics of transport phenomena[1]. A typical device, where spincaloritronic effects are found and can be exploited for experiments, is a bilayer made of a ferrimagnetic insulator (e.g. yttrium iron garnet, YIG) and a non magnetic metal with a strong spin-orbit coupling (e.g. platinum, Pt)[14]. In these devices the spin current is generated longitudinally (along the x axis), normal to the film surface. The experimental value which represents, within the uncertainty, both the SPE and the SSE response of the specific device is (6.2 ± 0.4) × 10−3 KA−1
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