过渡金属及其合金自旋霍尔效应研究

本项目拟针对国际新兴研究热点之一自旋霍尔效应开展研究。利用磁控溅射、分子束外延等方法制备高质量的单晶和多晶非磁过渡金属/磁性金属双层膜，采用光刻技术制备自旋霍尔效应测量样品，并通过磁光克尔效应测量仪、振动样品磁强计、变频铁磁共振与输运测量联用系统等测量技术研究过渡金属及其合金的自旋霍尔效应特性。通过单晶样品探索自旋霍尔效应的来源及可能的界面调控，采用掺杂手段寻找具有高自旋流电荷流转换效率和自旋扩散长度较长的优质自旋电子学材料。实验上探索自旋霍尔效应及其潜在应用。

In this proposal, we plan to focus on the study of the spin Hall effect (SHE) of transition metals, one the emerging and hot directions in spintronics. The samples, both single crystalline and polycrystalline nonmagnetic transition metal and magnetic double-layer stripes will be prepared with magneto-sputtering, molecular beam epitaxy (MBE) and lithography techniques. The magnetic and transport measurements will be carried out by magneto-optical Kerr effect, vibrating sample magnetometer and a home-built variable frequency ferromagnetic resonance apparatus. We plan to explore the intrinsic property of SHE through the study of single crystalline samples prepared by MBE, and find the possibility to tune the SHE through the interface engineering. Further, we will study the dopant dependent SHE through doping impurities into the metals with long spin coherent length, and search for the materials with both high spin-charge transfer ratio and long spin coherent length for the spintronics applications.