Abstract
FePt/B 4C multilayer composite films were prepared by magnetron sputtering and subsequent annealing in vacuum. By changing Fe layer thickness of [Fe/Pt] 6/B 4C films, optimal magnetic property (8.8 kOe and remanence squareness is about 1.0) is got in [Fe(5.25 nm)/Pt(3.75 nm)] 6/B 4C sample whose composition is Fe rich and near stoichiometric ratio. The characterizations of microstructure demonstrate that the diffusion of B and C atoms into FePt layer depends strongly on B 4C interlayer thickness. When B 4C interlayer thickness of [Fe(2.625 nm)/Pt(3.75 nm)/Fe(2.625 nm)/B 4C] 6 films is bigger than 3 nm, stable value of grain size (6–6.5 nm), coercivity (6–7 kOe) and hardness (16–20 GPa) is observed. Finally, the multifunctional single FePt/B 4C composite film may find its way to substitute traditional three-layer structure commonly used in present data storage technology.
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