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

在本研究中，我们尝试利用电流透过磁光效应(MOKE)来侦测铂栅边的自旋累积信号，建立了一套基于偏振调制技术的带有MOKE探测器的光学衍射仪。选用蓝光半导体激光器作为光源，根据波长的不同设计了光栅，采用了交流电流和偏振调制的双调制技术。目前还没有观察到明显的自旋积累信号，这表明还需要进行其他改进来降低背景噪声，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.