Spontaneous Spin Coherence in n-GaAs Produced by Ferromagnetic Proximity Polarization

Preprint

19 January 2002

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0201350

Abstract

We find that photoexcited electrons in an n-GaAs epilayer rapidly (< 50 ps) spin-polarize due to the proximity of an epitaxial ferromagnetic metal. Comparison between MnAs/GaAs and Fe/GaAs structures reveals that this coherent spin polarization is aligned antiparallel and parallel to their magnetizations, respectively. In addition, the GaAs nuclear spins are dynamically polarized with a sign determined by the spontaneous electron spin orientation. In Fe/GaAs, competition between nuclear hyperfine and applied magnetic fields results in complete quenching of electron spin precession.

Keywords

FERROMAGNETIC PROXIMITY
PROXIMITY POLARIZATION
SPIN POLARIZATION
SPONTANEOUS SPIN
GAAS PRODUCED
COHERENT SPIN
ELECTRON SPIN

All Related Versions

Version 1, 2002-01-19, ArXiv
Published version: Physical Review B, 65 (12), 121202.

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