Magnetic properties of CoTb/FePt(001) nano-bilayer films

The magnetic properties and microstructure of CoTb/FePt bilayer films are investigated. The magnetic anisotropy of the Co70Tb30/FePt(001) film is perpendicular to the film plane. The saturated magnetization (Ms) and perpendicular coercivity () of the Co70Tb30/FePt(001) bilayer films are higher than those of single-layered Co70Tb30 films. The and Ms are 5450 Oe, and 403?emu?cm?3, respectively. As the temperature is increased to 200??C, there is a rapid decrease in the value.