Spin Polarization of Alternate Monatomic Epitaxial [Fe/Co]<sub>n</sub> Superlattice

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<jats:p> The spin polarization (<jats:italic>P</jats:italic>) of alternate monatomic layered (AML) epitaxial [Fe/Co]<jats:sub> <jats:italic>n</jats:italic> </jats:sub> superlattices grown on MgO(001) substrates by electron beam (EB) evaporation has been measured by the point contact Andreev reflection (PCAR) method. The intrinsic transport <jats:italic>P</jats:italic> of 0.60 was obtained for the AML epitaxial [Fe/Co]<jats:sub> <jats:italic>n</jats:italic> </jats:sub> superlattice grown at 75 °C, which is comparable to that of half-metallic Heusler alloys measured by PCAR. The AML epitaxial [Fe/Co]<jats:sub> <jats:italic>n</jats:italic> </jats:sub> superlattices on MgO(001), which are expected to possess the B2 ordered structure, show the highest spin polarization of metallic Fe–Co alloy films. </jats:p>

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