Evaluation of Perpendicular Anisotropy of Magnetooptical Recording Film Using 45° Hall Effect Method

The author has developed a new method to measure the effective magnetic anisotropy field Hk´ of RE-TM magnetooptical recording film using the spontaneous Hall effect. By this method, the Hk´ can be obtained from measurement of the spontaneous Hall loop with respect to a magnetic field applied obliquely, at 45° from the normal to the film. The value of Hk´ obtained by the Hall method agrees fairly well with values determined by the conventional VSM/torque method. This paper describes the new method and presents experimental results.