Recording Characteristics of BaM Thin Films

Evaluations of recording density using ring heads with relatively wide apertures on thin films of different ¿¿50 used for disk media (2 inch ¿), and evaluations of the thermal stability of BaM thin films are reported. The possibility of obtaining a high recording density thin film with small ¿¿50 was clearly established. Changes in residual magnetization with respect to temperature variation were measured, revealing that when the film was left to stand for 15 h at 250°C approximately 10 percent thermal demagnetization occurred, and the film was almost completely demagnetized at 375°C.