Fast calculation of read field from perpendicular recording medium using head characteristic matrix

The aim of the paper is to shown that the three dimensional read head field from a perpendicular recording medium can be calculated by using Fourier components of the field. According to the method the magnetic potential components phi can be obtained from the medium charge after spacing loss correction sigma_o and the head characteristic matrix K by using the equation phiapK^-1sigma_o. The components of the matrix K can be calculated with using a numerical integration. Here the transformation can be generalized to three dimensional cases, and be applied to the calculation of the components of the head characteristic matrix K. The head characteristic matrix can be physically interpreted in terms of self energy of the field.