Cooling a magnetic nanoisland by spin-polarized currents.
Cooling a magnetic nanoisland by spin-polarized currents.
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通过自旋极化电流冷却磁性纳米岛
DOI：
10.1103/physrevlett.113.076602
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发表时间：
2014
影响因子：
8.6
通讯作者：
M. Thorwart
中科院分区：
文献类型：
--
作者：
J. Brüggemann;S. Weiss;P. Nalbach;M. Thorwart
我们研究了利用磁力耦合的自旋极化隧穿电荷流对磁性量子点振动模的冷却。自旋极化电流使磁性纳米岛极化，从而降低其磁能。同时，欧姆加热增加了振动能量。一个小的磁力耦合，然后允许我们从振动运动中去除能量，冷却是可能的。我们发现振动能的减少低于其平衡值的50%。最低的振动温度实现了弱的电子振动耦合和一个可比的磁力耦合。冷却速率随着磁力耦合的增加而先增大后饱和。
We investigate cooling of a vibrational mode of a magnetic quantum dot by a spin-polarized tunneling charge current exploiting the magnetomechanical coupling. The spin-polarized current polarizes the magnetic nanoisland, thereby lowering its magnetic energy. At the same time, Ohmic heating increases the vibrational energy. A small magnetomechanical coupling then permits us to remove energy from the vibrational motion and cooling is possible. We find a reduction of the vibrational energy below 50% of its equilibrium value. The lowest vibration temperature is achieved for a weak electron-vibration coupling and a comparable magnetomechanical coupling. The cooling rate increases at first with the magnetomechanical coupling and then saturates.