ANGULAR-DEPENDENCE OF SUSCEPTIBILITY IN THIN FE78B19SI3 FILMS

The differential transversal susceptibility as a function of an extern al magnetic field was measured for several directions of the magnetic field with respect to the anisotropy axis. Both the anisotropy field a nd coercive field were determined by analyzing the symmetry properties of the susceptibility field dependence. The Stoner-Wohlfarth model wa s modified by introducing an internal field and used to fit the experi mental data. The hyperbolic parts of susceptibility curves correspondi ng to single domain states were well reproduced by fitting the appropr iate constant value of the internal field.