Above-room-temperature giant thermal conductivity switching in spintronic multilayers
Above-room-temperature giant thermal conductivity switching in spintronic multilayers
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DOI：
10.1063/5.0032531
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发表时间：
2021-01-25
影响因子：
4
通讯作者：
Uchida, Ken-ichi
中科院分区：
文献类型：
--
作者：
Nakayama, Hiroyasu;Xu, Bin;Uchida, Ken-ichi
热开关是一种有效的主动热流控制方法，近年来在纳米级热管理技术方面受到越来越多的关注。在磁性和自旋电子材料中，热导率取决于磁化结构：这就是磁热电阻效应。在这里，我们表明，外延Cu/Co 50 Fe 50多层膜表现出巨大的磁场诱导调制的跨平面热导率。Cu/Co_（50）Fe_（50）多层膜的室温磁热电阻率达到150%，远高于以往的最高值。虽然该比值随温度的升高而减小，但在400 K以下仍出现接近100%的巨磁热电阻效应。的Cu/Co 50 Fe 50多层的热导率的磁场依赖性被观察到是约两倍大于跨平面的电导率。巨磁热电阻效应的观察阐明了自旋电子多层膜作为热开关器件的潜力。
Thermal switching provides an effective way for active heat flow control, which has recently attracted increasing attention in terms of nanoscale thermal management technologies. In magnetic and spintronic materials, the thermal conductivity depends on the magnetization configuration: this is the magnetothermal resistance effect. Here, we show that an epitaxial Cu/Co50Fe50 multilayer film exhibits giant magnetic-field-induced modulation of the cross-plane thermal conductivity. The magnetothermal resistance ratio for the Cu/Co50Fe50 multilayer reaches 150% at room temperature, which is much larger than the previous record high. Although the ratio decreases with increasing the temperature, the giant magnetothermal resistance effect of similar to 100% still appears up to 400K. The magnetic field dependence of the thermal conductivity of the Cu/Co50Fe50 multilayer was observed to be about twice greater than that of the cross-plane electrical conductivity. The observation of the giant magnetothermal resistance effect clarifies the potential of spintronic multilayers as thermal switching devices.