Abstract
The local structure surrounding Co atoms in CoPd (1 1 1) multilayers, [Co χ Å + Pd 24 Å] × 13 is investigated using polarized extended X-ray absorption fine structure (PEXAFS). The PEXAFS results show ther is a considerable amount of Co-Pd alloy-like phase near interfaces, e.g., 31 at.% Co for χ = 3.2 in a range extending 2.5 Å on their side of the nominal Co layer. The in-plane tensile strains mainly lead to out-of-plane magnetization, combined with a much more negative value of the magnetostriction coefficient λ1 1 1 of the alloy phase. The alloy-like region should be considered in experiments and theories.
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