Abstract
A new method is proposed for checking the magnetic anisotropy of rare earth-transition metal amorphous alloy films for thermomagnetic recording. The Hall loop is measured when the magnetic field H is applid to the film with inclination angle α (being measured relative to the film normal), and the relationship between the loop coercivity Hc′ and γ, the orientation angle of H in the film plane, is plotted in polar coordinates. According to the theoretical consideration, if the film has the oblique magnetic anisotropy then the shape of the Hc′-γ plot is elliptical. Therefore, if the measured Hc′-γ plot fits this elliptical law then the direction of the magnetic easy axis of the film can be calculated using the equations presented in this paper.
