The decrease of the average magnetic grain size with increasing Ag spacer thickness was deduced recently from bulk magnetic properties of Fe/Ag granular multilayers. Now we show detailed Mössbauer spectroscopy measurements that support this finding and determine the hyperfine fields of Fe atoms in the grain boundaries. The grain size estimated by a simple model from the grain boundary fraction agrees well with that obtained from the external field dependence of the hyperfine field in the superparamagnetic state.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Aug 28 2007|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics