Observation of accumulated spins through magneto-optical effect in reciprocal space

利用磁光效应（MOKE）探测电流作用下铂光栅边缘的自旋积累信号，建立了基于偏振调制技术的MOKE探测器光学衍射仪。选用蓝色半导体激光器作为光源，根据波长设计光栅，采用交流电流和偏振调制的双重调制技术。自旋积累信号的差异尚未观察到，这表明需要其他改进来降低背景噪声并增强自旋积累信号。

In this study, we attempted to detect spin accumulation signal at the edges of platinum gratings with electric current through magneto-optical effect(MOKE) .An optical diffractometer equipped with a MOKE detector based upon a polarization modulation technique was built. A blue laser diode is chosen as a light source and the gratings were designed by taking account of the wavelength.A double modulation technique of the ac current and polarization modulation was adopted. The distinct of spin accumulation signal has not been observed yet, suggesting that other improvements are needed to reduce the background noise and to enhance the spin accumulation signal.