Magnetic fields of finite track width heads

Closed form field solutions are given for finite gap, infinite length heads of either semi-infinite or zero track width. A three dimensional head of finite track width is approximated by superposition. By viewing the finite width head at a different angle, the results also apply to a semi-infinite width head with finite gap depth. At distances greater than one-half gap length removed, the maximum field error of the superposition does not exceed 8% and decreases with increasing head width.