Generation and detection of spin current in p-type nonmagnetic semiconductors

利用铁磁半导体（Ga,Mn）As/非磁性半导体p-GaAs，我们成功地利用自旋泵浦在p-GaAs中产生自旋电流，并利用反向自旋霍尔效应产生的电压检测自旋电流。我们证明了电压也是由（Ga,Mn）As中的流磁效应引起的，并建立了分离不同来源电压的方法。我们已经证明，该方法适用于金属体系，如Py/Pt双层。

By using a ferromagnetic semiconductor (Ga,Mn)As/nonmagnetic semiconductor p-GaAs, we have succeeded to generate spin current in p-GaAs by spin pumping and to detect it by electrical voltage induced by the inverse spin Hall effect. We have shown that the voltage is also induced by the galvanomagnetic effects in (Ga,Mn)As, and established the method for separating the voltages of different origins. We have shown that the method is applicable to metallic systems such as Py/Pt bilayers.