Magnetic and electric hyperfine interactions observed in situ by conversion-electron M\"ossbauer spectroscopy in 3 and 7 monolayers thick Fe films grown epitaxially in UHV on Cu(001) at 300 K provide microscopic evidence for a thickness-dependent transition from a high-moment ferromagnetic state with an anisotropically expanded fcc (fct-like) structure (c/a>1) to a low-moment antiferromagnetic isotropic fcc state. In similar films grown at ~90 K and annealed to 300 K, however, this high-moment fct-like phase was found to exist at both thicknesses. We conclude that the high-moment ferromagnetic state can exist in fct-like Fe only, but not in fcc Fe.
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Ellerbrock et al. (1995) studied this question.
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