A theoretical treatment of self-demagnetization in magnetic recording

A model for self-demagnetization is proposed which states that the value of the field and magnetization at every point in the material represent a point on a particular hysteresis loop of the material. This loop can either be a major or a minor loop of the material. The particular loop ascribed to a point is determined by the magnetization which existed at that point initially. This model has been applied to an ideal case of longitudinal recording. The results are compared with the Kostyshyn model for self-demagnetization and with experimental data.