Rotational Magnetization Lag-Angle Plots Using the Anisotropic Stoner–Wohlfarth Model

A numerical implementation of the classical Stoner-Wohlfarth (SW) model to simulate the magnetization angle of an assembly of SW particles with an effective axis of anisotropy under a rotating applied field is presented. Using an angular distribution for the angle each SW particle is making with the medium's reference axis, the proposed model successfully simulated lag-angle plots exhibiting the same rotational magnetization behavior measured for different ellipsoidally magnetizable media in the literature. The developed algorithm provides a simple tool for rotational-energy-loss calculations, preserves the physical intuition of the classical SW model, and is computationally faster compared to the Preisach-Stoner-Wohlfarth models. The effect of the angular distribution parameters on the switching transition angle and the algorithm's potential for modeling additional anisotropies through using different angular distributions are discussed.