Computation and measurement of the interaction field distribution in recording media

A method that was proposed for the identification of the parameters of the CMH model assumed that the Preisach function was the product of a Gaussian function of the interaction field and a Gaussian function of the critical field. While the latter function is an approximation that is good only for materials whose coercivity is large compared to the standard deviation of critical fields, the former function is applicable to a wide range of magnetic materials. This paper discusses the theory of the interaction field and measurements of it using an anhysteretic magnetizing process. It is shown that the moving model corrects the apparent deviation from Gaussian behavior.