Abstract

The method of anisotropy measurement of gamma -ray emission from spin-polarised nuclei has been applied to the FCC Fe54Mn46 alloy to deduce the ground-state magnetic structure. Measurements were made at temperatures down to 240 mu K, and the observed anisotropy of the emission from 54Mn isotopes embedded in the single-crystal sample gives definitive evidence for the triple-Q spin-density wave in this material.

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