The annealing of a [Tb(48 Angstrom)/Fe(26 Angstrom)]x77 multilayer ind
uces the apparition at room temperature of a significant perpendicular
magnetic anisotropy shown by Fe-57 Mossbauer spectrometry. This pheno
menon is related to the existence of an amorphous and homogenous Tb-Fe
alloy, located at the interfaces, which is produced by interdiffusion
during the heat processing.