Structure and stability of Fe−Mg amorphous alloys prepared by coevaporation

The structure, stability and magnetic properties at 77K of Fe₆₀Mg₄₀ amorphous thin films prepared by coevaporation are investigated using mainly Mössbauer effect working in scattering geometry and transmission electron microscopy. The temperature range of the amorphous to crystal transition is determined; moreover a superparamagnetic-like behaviour of the films is pointed out at 77K.