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Applied Physics Letters
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Fast electrical switching of spin injection in nonlocal spin transport devices

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Abstract

We present spin-injection experiments in a nonlocal spin transport device where spin is injected from a ferromagnetic FeCo electrode into a GaAs epilayer. The magnetization of the injection contact is switched by Oersted fields generated by alternating current pulses. This enables fast and offset-free measurements of nonlocal spin signals. Due to a negligible time-averaged electron spin polarization, dynamic nuclear polarization effects are small and Hanle curves measured down to T=3 K can be fit very accurately by drift-diffusion theory if a small constant Overhauser field BN =0.4 mT is accounted for. © 2011 American Institute of Physics.

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Applied Physics Letters

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