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• W2027393670 abstract "We use point contact Andreev reflection spectroscopy to measure the transport spin polarization of MnAs epitaxial films grown on (001) GaAs. By analyzing both the temperature dependence of the contact resistance and the phonon spectra of lead, acquired simultaneously with the spin polarization measurements, we demonstrate that all the contacts are in the ballistic limit. A ballistic transport spin polarization of approximately 49% and 44% is obtained for the type $A$ and type $B$ orientations of MnAs, respectively. These measurements are consistent with our density functional calculations, and with recent observations of a large tunnel magnetoresistance in MnAs/AlAs/(Ga,Mn)As tunnel junctions." @default.
• W2027393670 created "2016-06-24" @default.
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• W2027393670 date "2003-11-24" @default.
• W2027393670 modified "2023-10-18" @default.
• W2027393670 title "Point contact spin spectroscopy of ferromagnetic MnAs epitaxial films" @default.
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• W2027393670 doi "https://doi.org/10.1103/physrevb.68.201307" @default.
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