Analysis of the dimensional dependence and internal field structure of ferrite head pole tip at saturation

摘要

When the deep gap field exceeds the onset of the saturation field the fringe-field becomes nonvanishing and retains a plateau value at large distances from the gap corner. The plateau values increase with increasing deep gap field and decrease with the head dimensions; correspondingly, the charge density on the pole surface also increases. The permeability and volume charge distribution near the pole tip corner at large deep gap fields is a sensitive function of the depth below the pole surface and of the extent of the gap saturation. As a result, the divergence of the magnetization in the region immediately below and a fraction of the gap length further below change signs drastically so that the bordering regions are oppositely charged.