Thickness dependence of microstructure and magnetic properties in FePt/B₄C multilayer thin films

FePt/B4C multilayer films with different single FePt layer thickness were prepared by magnetron sputtering and subsequently annealing in vacuum. Influence of single FePt layer thickness on microstructure and magnetic property of FePt/B4C films is investigated. Experimental results suggest that the Fe and Pt rich regions will appear in the interior of single FePt layer. The increasing of FePt layer thickness leads to the increase of grain size and volume fraction of order phase f (0), which eventually induce satisfied coercivity (5.8 kOe).