Method for testing hard and easy magnetization direction of exchange bias film

The invention relates to a magnetic measurement method, in particular to a method for testing a hard and easy magnetization direction of a magnetic film material with exchange bias. The method comprises the following steps of: arranging a sample film to be tested in an external direct current magnetic field, so that a plane of the sample film to be tested is parallel to the direction of the external magnetic field; rotating the sample film to be tested around an axis vertical to the plane; during test, optionally applying a given external magnetic field, keeping the magnetic field invariable, and recording an initial position of the sample and magnetization at the moment; rotating the sample film to be tested at an angle, and measuring a corresponding projection value M of spontaneous magnetization MS of the film to be tested in the direction of the external magnetic field at the angle theta0 so as to obtain a function of the sample film to be tested at different rotating angles theta0 and corresponding M values; and determining an easy magnetization axis or a hard magnetization axis of the exchange bias film according to a measured M-theta0 curve.