Abstract
An investigation of fcc ${\mathrm{Ni}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}$ thin films utilizing a combination of M\"ossbauer spectroscopy and magnetometry presents clear evidence for the emergence of a low-spin antiferromagnetic state in the region of high Fe concentration, which coexists with a high-spin ferromagnetic state. The emergence of this state is observed by magnetometry as a drop in the saturation moment while M\"ossbauer spectroscopy reveals the appearance of a low-spin antiferromagnetic state. Evidence of superparamagnetic behavior indicates that the portion of the sample in the high-spin state may exist as clusters in a matrix of the low-spin state.
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