EXPERIMENTAL COMPARISON AND ANALYSIS OF COERCIVITY MODELS

Results corresponding to the temperature dependence of the coercive force of Ba hexaferrite samples are discussed in the framework of two different coercivity models based, respectively, on considerations about the coupling between the magnetization and the microstructure (micromagnetic model) and on the conditions of propagation of a reversed magnetization nucleus (global model). We conclude that, in the case of our samples, upon modifying the global model to account for the temperature evolution of the shape of the reversed nucleus, equivalent information about the local anisotropy at the site from which magnetization reversal proceeds can be obtained from both models.