Abstract
FePt/B4C multilayer films were prepared by magnetron sputtering on a heated Si (1 0 0) substrate. Experimental results suggest that interfacial diffusion of compositional atoms is finite, making the multilayer configuration stable. By changing the FePt layer and B4C layer thickness, the effect of interfacial diffusion on microstructure, magnetic properties and hardness is investigated. As the FePt layer thickness varies from 6 to 12 nm, the coercivity increases quickly from 1.2 to 5.0 kOe which is induced by the increase in pinning sites. At the same time, satisfactory coercivity (6.58 kOe) and hardness (15–19 GPa) are obtained by changing the B4C layer thickness.
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