Abstract
It is shown that the tunnel barrier for electron tunneling from a paramagnet to a ferromagnet preferentially enhances the majority-spin tunneling probability, thus resulting in spin selection. This is due to the ferromagnet-exchange-field penetration into the tunnel barrier. In the context of this effect, we discuss experiments reported by Tedrow and Meservey [Phys. Rev. B 7, 318 (1973)].
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