Writing process on a permeable recording layer: A fundamental issue in perpendicular recording

Normally, the head field is calculated without considering the influence of the recording layer, causing some inaccuracies on certain occasions. In this work, we describe the writing process on a permeable, perpendicular recording medium from both a simple reluctance analysis and complete micromagnetic simulations. It is found that: (i) the initial writing field is always reduced in perpendicular recording scheme, and the head-field rise-time could be somewhat prolonged in the presence of the permeable recording media, (ii) the writing field at saturation could be enhanced up to 10%-20%. (C) 2003 American Institute of Physics.