Correlation between Spin Polarization and Magnetic Moment in Ferromagnetic Alloys

Details Correlation between Spin Polarization and Magnetic Moment in Ferromagnetic Alloys Correlation between Spin Polarization and Magnetic Moment in Ferromagnetic Alloys

1999-03-07

arxiv.org/abs/cond-mat/9903118v2

Physics

Condensed Matter

Materials Science

8 RevTEX pages, 9 figures in eps

Scientific paper

10.1063/1.370766

The correlation between the magnetic moment in ferromagnetic alloys and the tunneling spin polarization in ferromagnet-insulator-superconductor tunneling experiments has been a mystery. The measured spin polarization for Fe, Co, Ni, and various Ni alloys is positive and roughly proportional to their magnetic moments, which can not be explained by considering the net density of states. Using a tight-binding coherent potential approximation (CPA) model, we show that while the polarization of the net density of states is not correlated with the magnetic moment, the polarization of the density of states of {\it s} electrons is correlated with the magnetic moment in the same manner as observed by the tunneling experiments. We also discuss the spin polarization measurements by Andreev reflection experiments, some of which obtained different results from the tunneling experiments and our calculations.

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