论文标题
自旋多层的室温巨型导热率转换
Above-room-temperature giant thermal conductivity switching in spintronic multilayer
论文作者
论文摘要
热开关为主动热流控制提供了一种有效的方法，最近在纳米级热管理技术方面引起了人们的关注。在磁性和自旋材料中，导热率取决于磁化构型：这是磁性热抗性效应。在这里，我们表明，外延cu/co $ _ {50} $ fe $ _ {50} $多层膜展示了巨大的磁场诱导的跨平面导热率的调制。 CU/CO $ _ {50} $ Fe $ _ {50} $多层的磁电阻比$ _ {50} $ _ {50} $ the Multilayer在室温下达到150％，这比以前的记录高得多。尽管该比率随温度的升高而降低，但〜100％的巨型磁电阻效应仍然显示为400 k。cu/co $ _ {50} $ _ {50} $ fe $ _ {50} $ _ {50} $ multilayer的磁场依赖性远高于跨跨plane plane plate plantic plate plantical plantical plantical plational plate plationtial tiveration。巨型磁性抗电阻效应的观察阐明了Spintronic多层体作为热开关设备的潜力。
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 magneto-thermal resistance effect. Here we show that an epitaxial Cu/Co$_{50}$Fe$_{50}$ multilayer film exhibits giant magnetic-field-induced modulation of the cross-plane thermal conductivity. The magneto-thermal resistance ratio for the Cu/Co$_{50}$Fe$_{50}$ 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 magneto-thermal resistance effect of ~100% still appears up to 400 K. The magnetic field dependence of the thermal conductivity of the Cu/Co$_{50}$Fe$_{50}$ multilayer was observed to be about twice greater than that of the cross-plane electrical conductivity. The observation of the giant magneto-thermal resistance effect clarifies a potential of spintronic multilayers as thermal switching devices.
