Abstract
Two-dimensional read/write simulation based on solution of the Poisson equation was performed on keepered media with a thin soft magnetic layer and a conventional recording one, and a thin-film head system. It was found that the center of the virtual gap created in the read process shifts to the direction opposite to the magnetization direction of the recording layer, and that this shift induces an asymmetrical output waveform. A permeability μ = 100 of the keeper layer was found to reduce the demagnetizing field in the recording layer by 1/2.
