We report the observation of magnetic-field-induced decrease of the spin Peltier effect (SPE) in a junction of a paramagnetic metal Pt and a ferrimagnetic insulator ${\mathrm{Y}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}$ (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 decreasing 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.

中文翻译：

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室温下Pt / Y3Fe5O12系统中磁场引起的自旋Peltier效应的降低

我们报道了在顺磁性金属Pt和亚铁磁性绝缘体的交界处磁场引起的自旋珀耳帖效应（SPE）下降的观察 ${\mathrm{ÿ}}_3{铁}_5{\mathrm{Ø}}_{12}$（YIG）在室温下。为了驱动SPE，通过自旋霍尔效应由Pt层中施加的电荷电流产生自旋电流，并将其注入到相邻的厚YIG膜中。通过连接到Pt / YIG结的常用热电偶来检测由此产生的温度调制。当磁化强度反转时，热电偶的输出显示符号反转，并且随着施加的电流线性增加，这表明检测到了SPE信号。我们发现，SPE信号随磁场而减小。发现观察到的下降速率与自旋塞贝克效应（SSE）的下降速率相当，这表明低能量磁振子在SPE中的作用与SSE中相同。