Structures and magnetic properties of isotropic nanostructured Fe-Pt thin films

Two series of isotropic nanostructured Fe-Pt permenent magnetic thin films have been prepared by sputtering Fe/Pt multilayers and subsequent vacuum an nealing. Their structures and magnetic properties have been investigated. S tudies show that Fe-Pt permenent magnetic thin films with Fe-rich were comp osed of two phases: a hard FePt phase and a soft Fe3Pt phase. Saturation ma gnetic polarization and remaenence increase with increasing thickness of th e Fe layer. Kelly-Henkel plot indicates that magnetic interactions in Fe-Pt thin films are mainly determined by ferromagnetic exchange interaction bet ween neighboring grains.