Thermal imaging of spin Peltier effect.

Thermal imaging of spin Peltier effect.
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DOI:
10.1038/ncomms13754
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发表时间:
2016-12-12
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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帕尔蒂埃效应对由两个不同导体组成的结点的温度进行调制,以响应穿过该结点的电荷电流,该结点用于固态热泵和电子产品中的温度控制器。最近,在自旋电子学中,观察到了与帕尔蒂埃效应相当的自旋效应。“自旋帕尔蒂埃效应”调节磁结的温度,以响应自旋电流。在这里,我们报道了自旋Peltier效应的热成像;使用主动热成像技术,我们可视化了从邻近金属注入磁绝缘体的自旋电流所引起的温度调制。热成像揭示了自旋电流感生热源的特征分布,导致温度变化仅限于金属/绝缘体界面附近。这一发现使我们能够估计自旋帕尔蒂埃效应引起的温度调制的实际幅度,这比之前认为的要大一个数量级以上。自旋帕尔蒂埃效应沿着自旋流的方向产生温差。在这里,作者使用一种主动热成像技术来显示从邻近金属注入到磁性绝缘体中的自旋电流所引起的温度调制。
The Peltier effect modulates the temperature of a junction comprising two different conductors in response to charge currents across the junction, 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 in response to spin currents. Here we report thermal imaging of the spin Peltier effect; using active thermography technique, we visualize the temperature modulation induced by spin currents 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. This finding allows us to estimate the actual magnitude of the temperature modulation induced by the spin Peltier effect, which is more than one order of magnitude greater than previously believed. The spin Peltier effect produces a temperature difference along the direction of a spin current. Here, the authors use an active thermography technique to visualize the temperature modulation induced by a spin current injected into a magnetic insulator from an adjacent metal.
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