Analytic fields and response functions for planar heads

The horizontal field and the spectral response function of a planar head wi th either constant or linear pole potential, derived by a 2-D Fourier analy sis, are presented. Exact Fourier coefficients are provided for a range of head dimensions. Good approximations can be achieved by evaluating the fiel d or the response using only a few terms of the series. Comparisons are mad e between planar heads and thin film heads and ring heads of corresponding dimensions. The horizontal field of a planar head has no undershoots nor do es the spectral response function exhibit head bumps. Linearly grading the potential of a planar head effectively increases the gap length. (C) 2000 E lsevier Science S.A. All rights reserved.