Transport spin polarization of Ni_xFe_{1-x}: electronic kinematics and band structure

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Abstract
We present measurements of the transport spin polarization of Ni_xFe_{1-x} (0<=x<=1) compounds using the recently-developed Point Contact Andreev Reflection technique. Surpisingly, the measured spin polarization is almost composition-independent. We have also performed first principles calculations of the spin polarization for this system. The results emphasize the importance of accounting for both the Fermi velocity anisotropy and the density of states. Calculations agree with the experiment reasonably well and indicate that the independence of the spin polarization of the composition is due to compensation of density of states and Fermi velocity in the s- and d- bands.

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