Development of efficient magnetic refrigeration technique using pure spin current

利用项目负责人开发的有效的纯自旋电流操纵技术，我们开发了一种新型的自旋冷却装置，可以操纵磁热材料的自旋熵。主要活动如下：高质量Gd纳米线的制备。亚微米Gd线M-H曲线的检测Gd4自旋吸收效率的评价。利用横向自旋电流的有效自旋吸收。由于纯自旋电流注入，热电电压降低。最后的结果表明，可以利用纯自旋电流实现自旋冷却。

By using efficient manipulation techniques of the pure spin current developed by the project leader, we develop a novel spin cooling device with manipulating the spin entropy of the magnetocaloric materials. The major activities are as follows.1. Fabrication of high quality Gd nano wire2. Detection of M-H curve of submicron Gd wire3. Evaluation of spin absorption efficiency of Gd4. Efficient spin absorption using transverse spin current5. Reduction of thermoelectric voltage due to pure spin current injection.The final result implies the realization of the spin cooling using pure spin current.