(001) oriented L1_0 FePt/B_4C multilayer thin films on naturally oxidized Si substrate

摘要

(001) oriented FePt/B_4C multilayer thin films with high perpendicular coercivity ( ≥ 9.7 kOe) were prepared on naturally oxidized Si substrates by magnetron sputtering and thereafter annealing. Effect of FePt layer thickness on the texture parameter of the (001) orientation, chemical ordering, and magnetic properties has been studied. It was found that the texture parameter of (001) orientation increases while the degree of chemical ordering decreases with the decrease of FePt layer thickness. The coercivity drops with the decrease of layer thickness due to the low degree of chemical ordering. The results of δM plots analysis show that intergrain exchange coupling action weakens in response to the decrease of layer thickness and thus decreases the remanence ratio.