Thermal imaging of spin Peltier effect

Abstract

When a charge current is applied to a junction comprising two different conductors, its temperature increases or decreases depending on the direction of the charge current. This phenomenon is called the Peltier effect, which is used in solid-state heat pumps and temperature controllers in electronics. Recently, in spintronics, a spin counterpart of the Peltier effect was observed. The "spin Peltier effect" modulates the temperature of a magnetic junction depending on the direction of a spin current. Here we report thermal imaging of the spin Peltier effect; using active thermography technique, we visualize the temperature modulation induced by a spin current injected into a magnetic insulator from an adjacent metal. The thermal images reveal characteristic distribution of spin-current-induced heat sources, resulting in the temperature change confined only in the vicinity of the metal/insulator interface. The finding of this anomalous temperature distribution allows us to estimate the actual magnitude of the temperature modulation induced by the spin Peltier effect, which is found to be more than one order of magnitude greater than that previously believed.

17 pages, 7 figures, 1 table

References in corpus (4)

• Direct electronic measurement of the spin Hall effect
• Spin Seebeck insulator
• Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor
• Theory of magnon-driven spin Seebeck effect

Cited by in corpus (14)

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• Magnetic-field-induced suppression of spin Peltier effect in Pt/${\mathrm{Y}}_3\mathrm{F}{\mathrm{e}}_5{\mathrm{O}}_{12}$ system at room temperature
• Transient response of spin Peltier effect revealed by lock-in thermoreflectance measurement
• Thermal effects in spintronic materials and devices: an experimentalist's guide
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• Deposition temperature dependence of thermo-spin and magneto-thermoelectric conversion in Co${}_2$MnGa films on Y${}_3$Fe${}_5$O${}_{12}$ and Gd${}_3$Ga${}_5$O${}_{12}$
• Cryogenic spin Peltier effect detected by a RuO${}_2$-AlO${}_x$ on-chip microthermometer
• Progress of microscopic thermoelectric effects studied by micro-and nano-thermometric techniques