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We report the observation of magnetic-field-induced suppression of the spinPeltier effect (SPE) in a junction of a paramagnetic metal Pt and aferrimagnetic insulator ${\rm Y_{3}Fe_{5}O_{12}}$ (YIG) at room temperature.For driving the SPE, spin currents are generated via the spin Hall effect fromapplied charge currents in the Pt layer, and injected into the adjacent thickYIG film. The resultant temperature modulation is detected by a commonly-usedthermocouple attached to the Pt/YIG junction. The output of the thermocoupleshows sign reversal when the magnetization is reversed and linearly increaseswith the applied current, demonstrating the detection of the SPE signal. Wefound that the SPE signal decreases with the magnetic field. The observedsuppression rate was found to be comparable to that of the spin Seebeck effect(SSE), suggesting the dominant and similar contribution of the low-energymagnons in the SPE as in the SSE.

Magnetic-field-induced suppression of spin Peltier effect in Pt/${\rm Y_{3}Fe_{5}O_{12}}$ system at room temperature