A thin film inductive write head for magnetic recording has a write gap formed
as a lamination of alternating layers of a nonmagnetic gap layer and a ferromagnetic
spacer layer. There are N gap layers and N-1 spacer layers, with each pole tip
of the write head being located adjacent to a gap layer. The spacer layers in the
gap structure are formed of a ferromagnetic material with a high saturation moment
density (BS) that is close to the BS of the spacer material
from which the pole tips are formed. Unlike the pole tips, the spacer layers are
not part of a magnetic circuit and are magnetically isolated, i.e., completely
surrounded by nonmagnetic gap material. The effect of the spacer layers is to effectively
divide the gap into a plurality of smaller gaps. The write head with the laminated
gap creates a write bubble that is narrower in the off-track direction and wider
in the in-track direction.