All-electrical spin injection and detection in the Co2FeSi/GaAs hybrid system in the local and non-local configuration

TL;DR

This paper demonstrates efficient all-electrical spin injection and detection in a Co2FeSi/GaAs hybrid system, showing significant local and non-local spin signals due to high spin polarization at the Fermi level.

Contribution

It reports the first demonstration of electrical spin injection and detection in Co2FeSi/GaAs using lateral structures with high signal quality.

Findings

Observation of spin valve signatures in both configurations

Large local spin valve signals with high signal-to-noise ratio

Confirmation of high spin polarization at the Fermi energy of Co2FeSi

Abstract

We demonstrate the electrical injection and detection of spin-polarized electrons in the Co2FeSi/GaAs hybrid system using lateral transport structures. Spin valve signatures and characteristic Hanle curves are observed both in the nonlocal and the local configuration. The comparatively large magnitude of the local spin valve signal and the high signal-to-noise ratio are attributed to the large spin polarization at the Fermi energy of Co2FeSi in the well-ordered L21 phase.