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

TL;DR

This study demonstrates that applying a magnetic field suppresses the spin Peltier effect in a Pt/YIG system at room temperature, revealing the role of low-energy magnons in spin caloritronic phenomena.

Contribution

It provides the first observation of magnetic-field-induced suppression of the spin Peltier effect at room temperature in a Pt/YIG junction.

Findings

SPE signal decreases with increasing magnetic field.

The suppression rate is comparable to the spin Seebeck effect.

Low-energy magnons significantly contribute to the SPE.

Abstract

We report the observation of magnetic-field-induced suppression of the spin Peltier effect (SPE) in a junction of a paramagnetic metal Pt and a ferrimagnetic 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 from applied charge currents in the Pt layer, and injected into the adjacent thick YIG film. The resultant temperature modulation is detected by a commonly-used thermocouple attached to the Pt/YIG junction. The output of the thermocouple shows sign reversal when the magnetization is reversed and linearly increases with the applied current, demonstrating the detection of the SPE signal. We found that the SPE signal decreases with the magnetic field. The observed suppression rate was found to be comparable to that of the spin Seebeck effect (SSE), suggesting the dominant and similar contribution of the low-energy magnons in the SPE as in the SSE.