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arXiv 1109.6898cond-mat.mes-hall
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用电子自旋冷却和加热:自旋Peltier效应的观察

Cooling and heating with electron spins: Observation of the spin Peltier effect

J. Flipse, F. L. Bakker, A. Slachter, F. K. Dejene, B. J. van Wees

摘要:

珀耳帖系数描述了电流通过材料时所携带的热量。将两种具有不同珀耳帖系数的材料连接起来会导致净热流朝向或远离界面,从而导致界面处的冷却或加热-珀耳帖效应。自旋电子学描述了电荷和角动量的传输,通过使用单独的自旋向上和自旋向下通道。近年来,热电学与自旋电子学的结合产生了一个崭新而丰富的研究领域--自旋热电子学。在这里,我们报告的第一个直接实验观察到的制冷/加热驱动的自旋电流,一个新的自旋热电效应,我们称之为自旋珀耳帖效应。热流由铁磁材料内部的珀耳帖系数的自旋依赖性产生。我们探讨了在一个专门设计的自旋阀柱结构的影响,通过测量温度,使用电隔离热电偶。两种磁配置之间的热流差异导致温度变化。借助三维有限元建模,我们提取了-0.9到-1.3 mV范围内的坡莫合金自旋Peltier系数。这些结果使磁控制的热流,并提供新的功能,为未来的自旋电子器件。

英文摘要:

The Peltier coefficient describes the amount of heat that is carried by an electrical current when it passes through a material. Connecting two materials with different Peltier coefficients causes a net heat flow towards or away from the interface, resulting in cooling or heating at the interface - the Peltier effect. Spintronics describes the transport of charge and angular momentum by making use of separate spin-up and spin-down channels. Recently, the merger of thermoelectricity with spintronics has given rise to a novel and rich research field named spin caloritronics. Here, we report the first direct experimental observation of refrigeration/heating driven by a spin current, a new spin thermoelectric effect which we call the spin Peltier effect. The heat flow is generated by the spin dependency of the Peltier coefficient inside the ferromagnetic material. We explored the effect in a specifically designed spin valve pillar structure by measuring the temperature using an electrically isolated thermocouple. The difference in heat flow between the two magnetic configurations leads to a change in temperature. With the help of 3-D finite element modeling, we extracted permalloy spin Peltier coefficients in the range of -0.9 to -1.3 mV. These results enable magnetic control of heat flow and provide new functionality for future spintronic devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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