Magnetic order of Co(sub 0.1)Pt(sub 0.9) in proximity in CoPt(sub 3)

摘要

A polarized neutron reflectometry study of the magnetization density depth profile of a Co(sub 0.1)Pt(sub 0.9)-CoPt(sub 3) bilayer film found evidence for an induced moment in the Co(sub 0.1)Pt(sup 0.9) overlayer in close proximity to the CoPt(sub 3) underlayer. If the moment of Co in these films is that of the bulk, then the (mu)(sub Pt) = 0.09(1)(mu)(sub B) in the overlayer, and (mu)(sub Pt) = 0.04(1)(mu)(sub B) in the underlayer. In addition, ferromagnetic order of the Co(sub 0.1)Pt(sub 0.9) overlayer was observed 8K above (Tc) for the material in the bulk.