Abstract
We report on the temperature dependence of the 111Cd magnetic hyperfine field in bcc-Co as measured in Fe/Co multilayers. An anomalous increase of the hyperfine field with temperature is observed. Below the growth temperature of the samples, the behaviour can be explained by simple thermal expansion of the lattice. At 570 K a relaxation of the interplanar distance accounts for the anomaly. This relaxation is interpreted as an onset to the degeneration of the forced bcc structure to an energetically more favorable Co-phase.
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