STUDY OF TB FE MULTILAYERS BY TEMPERATURE-DEPENDENT CEMS/

A comparative study is accomplished in the domain where iron layers ar e amorphous. The dependence of the magnetic structure of Tb/Fe multila yered films on temperature have been investigated by Mossbauer spectro metry. When the iron layer is thinner than 2.3 nm, the average hyperfi ne field at the iron site remains nearly constant at 4.2 K, while it d ecreases strongly for iron thickness higher than 1.5 nm at room temper ature. This decrease of [H] is due to the decrease of the Curie temper ature, which can be explained from the structure of iron layers.