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

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

2002-01-19

arxiv.org/abs/cond-mat/0201350v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 4 figures, in press, Phys. Rev. B Rapid Communications (2002)

Scientific paper

10.1103/PhysRevB.65.121202

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.

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