Patent ID: 6975485

Claim:
A method of constructing a thin film inductive write head having a write bubble, the method including forming first and second ferromagnetic pole pieces each of which has a pole tip, an electrically conductive coil structure between the first and second pole pieces, and a gap structure between the pole tips that includes i) a first nonmagnetic gap layer adjacent to the first pole tip, ii) a second nonmagnetic gap layer adjacent to the second pole tip, and iii) a ferromagnetic spacer layer between the first and second gap layers, wherein the improvement comprises: selecting the thicknesses of the gap layers and the spacer layer to narrow the write bubble in an off-track direction of a magnetic recording medium, wherein the head has a design magnetic spacing D, wherein G′ is the sum of the thicknesses of the first and second gap layers and wherein G′ is between D and 5D.