Stoner-Wohlfarth model for the anisotropic case

The Stoner-Wohlfarth (SW) model was calculated for the anisotropic case, by assuming crystal-lographical texture distributions as Gaussian, Lorentzian and Cos(n) (alpha). All these distributions were tested and both Gaussian and Cos (alpha) give similar results for M(r)/M(s) above 0.8. However, the use of Cos(n) (alpha) makes it easier to find analytical expressions representing texture. The Lorentzian distribution is a suitable choice for not well aligned magnets, or magnets with a high fraction of misaligned grains. It is discussed how to obtain the alignment degree M(r)/M(s) directly from two measurements of magnetic remanence at the transverse and parallel directions to the alignment direction of the magnet. It is demonstrated that even the well aligned magnets with M(r)/M(s)=0.96 present coercive field of 60-70% of the anisotropy field, depending on the chosen distribution. The anisotropic SW model was used for discussing hysteresis squareness. Improving the crystalographical texture, the loop squareness also increases.