INCOHERENT ROTATION IN BARIUM FERRITE THIN-FILM RECORDING MEDIA

The angular dependence of the remanent magnetic properties of uniaxial ly in-plane oriented barium ferrite films were found to deviate signif icantly from the Stoner-Wohlfarth (SW) coherent rotation model. The in -plane torque and the rotational hysteresis were studied in both align ed and randomly oriented films. They were found to be different from t hat calculated from the SW coherent rotation model, and suggested inco herent rotation of magnetization during the switching process. Incoher ent rotation was found to be dependent on grain size and intergranular interactions.