A new method for analyzing torque curves of uniaxial anisotropic materials

The authors present a simple analytic method to determine the intrinsic anisotropy energy K/sub u/ and the easy axis orientation delta of a magnetic film having a uniaxial anisotropy, using a measured torque curve. Analytical expressions for K/sub u/ and delta are explicitly derived using the peak value in the measured torque curve and the angle where the torque is zero. The authors confirmed that the experimental torque curves of TbFe thin films prepared at oblique incidence match well to the theoretical curves within 10% accuracy.<>