Direct measurement of the spin polarization of the magnetic semiconductor (Ga,Mn)As |
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Authors: | Braden J G Parker J S Xiong P Chun S H Samarth N |
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Institution: | MARTECH and Department of Physics, Florida State University, Tallahassee, Florida 32306, USA. |
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Abstract: | We have carried out a direct measurement of the degree of spin polarization (P) of the magnetic semiconductor Ga1-xMnxAs using Andreev reflection spectroscopy. Analyses of the conductance spectra of high transparency Ga(0.95)Mn(0.05)As/Ga junctions consistently yield an intrinsic value for P greater than 85%. Our experiments also revealed an extreme sensitivity of the measured spin polarization to the nature and quality of the interface for this material. |
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