Electrical injection of spin-polarized electrons and electrical detection of dynamic nuclear polarization using a Heusler alloy spin source

Takafumi Akiho, Jinhai Shan, Hong-xi Liu, Ken-ichi Matsuda, Masafumi Yamamoto, Tetsuya Uemura
2013 Physical Review B  
We demonstrated electrical spin injection from a half-metallic Heusler alloy Co 2 MnSi electrode into a GaAs channel through observation of a spin-valve signal and a Hanle signal in the four-terminal nonlocal geometry. Furthermore, we electrically detected a nuclear field acting on electron spins, which was produced by the dynamic nuclear polarization, through observation of transient oblique Hanle signals. Samples with a Co 2 MnSi spin source exhibited higher spin-injection efficiency and a
more » ... ger nuclear field compared to samples with a Co 50 Fe 50 spin source, suggesting that the spin polarization of Co 2 MnSi is higher. This higher polarization is promising for realizing future spintronic devices and for understanding spin interactions as well as spin-dependent transport properties in a semiconductor channel.
doi:10.1103/physrevb.87.235205 fatcat:vetvcz6bz5brbd5cx2qoxsgvee