Abstract
${}^{57}\mathrm{Fe}$ diluted in Ag film has been prepared by vapor quenching onto a kapton substrate kept at 16 K. M\ossbauer spectroscopy (MS), under 1.5 and 3.7 T applied fields, and temperature-dependent, in situ and ex situ, measurements have been performed to investigate the site occupation and magnetism of Fe atoms, thermal stability of the Fe species, and Fe cluster formation. In situ ${}^{57}\mathrm{Fe}$ MS for the as-prepared film, measured at 10 K indicates that 74% of Fe atoms are randomly distributed at substitutional sites in fcc Ag matrix (Fe monomer), 20% are associated with Fe dimers, and the remaining Fe atoms form a fcc Fe phase. MS under applied field indicates that each Fe phase has its own magnetic moment. Temperature-dependent MS shows that the Fe monomers and Fe dimers diffuse, forming fcc-like Fe clusters probably distributed at the grain boundaries of the Ag matrix. The fcc Fe phase with particle sizes at about 20 \AA{} is completely transformed to bcc like phase at high temperature. An ex situ MS experiment, at 4.2 K without an external field, shows that the magnetic moment of the Fe monomer is frozen by exchange magnetic coupling or by dipolar interactions created by the large Fe clusters present in the annealed film.
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