Bi底层对FexPt100-x(x = 40～58)薄膜磁性的影响

Effect of a Bi underlayer on ordering and coercivity Hc of FexPt100-x thin films (atomic content of Fe x = 40～58) has been studied. Experimental results show the obvious enhancement of Hc by the Bi underlayer. A Bi / Fe49Pt51 film can realize a Hc as high as 1074.3 kA/m and the ratio of the remnant magnetization Mr to the saturation one Ms of 0.93 after annealing at 400 for 20minutes. The acceleration of ordering process should be related to diffusion of Bi atoms. We can obtain the FexPt100-x films with relatively high coercivity at the range of x = 49～55. Whereas, the range responding to high Hc of Bi / FexPt100-x films is broadened to x = 43～55 and the Hc of Bi / FexPt100-x films at this range is little affected by the ratio of Fe to Pt.