Saturation effects on read/write characteristics of asymmetric ring head

Asymmetric head field profiles, flux line distribution, and the corresponding spectral response functions, etc. have been calculated for a linear core with constant permeability and a nonlinear core with B -H loop based on finite-element analysis. The inclination angles ranging from 0° to 75° have been considered. It is shown that beyond some inclination angles the field intensity based on a Schwartz-Christoffel (S-C) transformation calculation is generally overestimated, the signal level too high by up to one to two orders of magnitude, compared to those of the nonlinear results depending on sharpness of the head considered. Numerically, the error incurred in the head field calculation in the linear core is less than 10% up to 45° inclinations, while the corresponding S-C results are generally ⩾45% for the magnetomotive force equal to 0.112 A-T considered