Mössbauer and TDPAC Studies on Fe/Mo Multilayers

Hyperfine fields at Fe and Mo layers in polyimide/Fe(10 nm)/[Mo(1.1 nm)/Fe(2.0 nm)]120 and [Mo(1.3 nm) /Fe(2.0 nm)]120 multilayers prepared by the electron-beam evaporation technique were measured at room-temperature by Mossbauer spectroscopy and perturbed-angular-correlation spectroscopy. The hyperfine fields in the Fe layers do not show a clear dependence on the Mo layer thickness. On the other hand, the hyperfine fields in the Mo layers show different magnetic structures in these samples. The difference suggests a variation of electron spin polarization in the Mo layers.