Spontaneous spin coherence inn-GaAs produced by ferromagnetic proximity polarization
- 13 March 2002
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 65 (12) , 121202
- https://doi.org/10.1103/physrevb.65.121202
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
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