Magnetic hyperfine field at dilutedFe57in vapor-quenched heavy-rare-earth films

Abstract

In this work, we combine vapor-quenching technique at low temperature (20 K) and {ital in situ} {sup 57}Fe M{umlt o}ssbauer spectroscopy at different temperatures (7{endash}300 K) to study out-of-equilibrium solubility and magnetic properties of {sup 57}Fe(5at.{percent}) in some magnetic heavy-rare-earth (RE) metals (RE=Dy, Ho, Er, and Tm). The spectra were fitted using the full Hamiltonian including electric quadrupole and magnetic interactions. Two magnetic components are observed in the 7 K M{umlt o}ssbauer spectra: one with a magnetic hyperfine field (B{sub hf}) varying between 5.3(2) and 1.9(2) T, which has been attributed to Fe at a substitutional site, and the other one, with a smaller field ({lt}2.1T), which is assumed to be due to Fe at an interstitial site. The behavior of B{sub hf} for Fe at the substitutional site in the different RE metals scales with the de Gennes factor. {copyright} {ital 1997} {ital The American Physical Society}