Lock-in thermography measurements of the spin Peltier effect in a compensated ferrimagnet and its comparison to the spin Seebeck effect

The spin Peltier effect (SPE) in a junction comprising a gadolinium-iron-garnet (GdIG) slab and a Pt film has been investigated around the magnetization compensation temperature of GdIG by means of the lock-in thermography method. When a charge current is applied to the Pt layer, a spin current is g...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2018-04, Vol.51 (19), p.194002
Main Authors: Yagmur, A, Iguchi, R, Geprägs, S, Erb, A, Daimon, S, Saitoh, E, Gross, R, Uchida, K
Format: Article
Language:English
Subjects:
spin caloritronics
spin current
spin Peltier effect
spin Seebeck effect
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Summary:The spin Peltier effect (SPE) in a junction comprising a gadolinium-iron-garnet (GdIG) slab and a Pt film has been investigated around the magnetization compensation temperature of GdIG by means of the lock-in thermography method. When a charge current is applied to the Pt layer, a spin current is generated across the Pt/GdIG interface via the spin Hall effect in Pt. This spin current induces a heat current and a measurable temperature change near the Pt/GdIG interface due to the SPE. The SPE signal in the Pt/GdIG junction shows a sign change around the magnetization compensation temperature, demonstrating the similar temperature dependence of the SPE and the spin Seebeck effect for the Pt/GdIG hybrid system.
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/aabc75