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arXiv 1607.01901cond-mat.mes-hallcond-mat.mtrl-sci
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自旋珀耳帖效应的热成像

Thermal imaging of spin Peltier effect

Shunsuke Daimon, Ryo Iguchi, Tomosato Hioki, Eiji Saitoh, Ken-ichi Uchida

摘要:

当充电电流施加到包括两个不同导体的结时,其温度根据充电电流的方向而增加或降低。这种现象被称为珀耳帖效应,用于电子设备中的固态热泵和温度控制器。最近,在自旋电子学中,观察到珀耳帖效应的自旋对应物。“自旋珀耳帖效应”根据自旋电流的方向调节磁性结的温度。在这里,我们报告的自旋珀耳帖效应的热成像,使用主动热成像技术,我们可视化的温度调制所引起的自旋电流注入到磁性绝缘体从相邻的金属。热图像揭示了自旋电流诱导的热源的特征分布,导致温度变化仅限于金属/绝缘体界面附近。这种异常温度分布的发现使我们能够估计由自旋珀耳帖效应引起的温度调制的实际幅度,发现其比先前认为的大一个数量级以上。

英文摘要:

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.

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