It is shown that the spin asymmetry of the elastic transmission of electrons through ferromagnetic films can approach unity. The polycrystalline Co films are a few nanometers thick and saturated with the magnetization →M in the plane. The contribution of spin-productive scattering events is below $5%$. If the electron spin at incidence is chosen to be perpendicular to →M, it rotates into the direction of →M and also precesses around it.
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Oberli et al. (1998) studied this question.
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