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We report on the study of the structural, magnetic and transport propertiesof highly textured MnBi films with the Curie temperature of 628K. In additionto detailed measurements of resistivity and magnetization, we measure transportspin polarization of MnBi by Andreev reflection spectroscopy and perform fullyrelativistic band structure calculations of MnBi. A spin polarization from51\pm1 to 63\pm1% is observed, consistent with the calculations and with anobservation of a large magnetoresistance in MnBi contacts. The band structurecalculations indicate that, in spite of almost identical densities of states atthe Fermi energy, the large disparity in the Fermi velocities leads to hightransport spin polarization of MnBi. The correlation between the values ofmagnetization and spin polarization is discussed.

Transport Spin Polarization of High-Curie Temperature MnBi Films