Stoner–Wohlfarth model for the anisotropic case

• The Stoner–Wohlfarth model was calculated for the anisotropic case.
• Different distribution functions for texture description were compared and discussed.
• Lorentzian distribution is adequate for not well oriented magnets.
• Determination of the alignment ratio Mr/Ms from 2 remanence measurements.
• Prediction of the coercive field in Stoner–Wohlfarth aligned magnets.

The Stoner–Wohlfarth (SW) model was calculated for the anisotropic case, by assuming crystallographical texture distributions as Gaussian, Lorentzian and Cosn (alpha). All these distributions were tested and both Gaussian and Cosn (alpha) give similar results for Mr/Ms above 0.8. However, the use of Cosn (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 Mr/Ms 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 Mr/Ms=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.