57Fe Mössbauer spectroscopy from Tb/Fe and Er/Fe multilayers

Mossbauer spectroscopy was carried out on Tb/Fe and Er/Fe multilayers. The dependence of the extension of the interface on the substrate temperature during the deposition process and its magnetic behaviour are shown. Easy plane of magnetization and perpendicular easy axis of magnetization have been observed in Er/Fe and Tb/Fe multilayers respectively. The effects of the ion anisotropy and of the thickness of the layers are discussed.