Write head having independent side shield and trailing shield throat height
View Patent ↗A magnetic write head for perpendicular magnetic recording. The magnetic write head includes a write pole having a pole tip region and a flared region. The write pole also has a trailing, wrap-around magnetic shield that is separated from the sides of the write pole by a non-magnetic side gap layer. The write head is formed such that the side gap spacing is larger in the flared region than in the pole tip region. This varying gap spacing can be formed by depositing a non-magnetic material using a collimated sputter deposition aligned substantially perpendicular to the air bearing surface. This collimated sputtering deposits the non-magnetic material more readily on the sides of the write pole in the flared region than in the pole tip region.
1. A write head for perpendicular magnetic recording, comprising
a magnetic write pole having a pole tip portion extending to an air bearing surface and a flared portion removed from the air bearing surface, the flared portion and pole tip portion meeting at a flare point;
a stitched magnetic layer formed over a portion of the write pole, the stitched magnetic layer having a front edge and first and second laterally opposed sides;
a non-magnetic layer formed over the first and second sides of the stitched magnetic layer and over the front edge of the stitched magnetic layer, the non-magnetic layer having a greater thickness at the sides of the stitched magnetic layer than at the front edge of the stitched magnetic layer.
2. A write head as in claim 1 wherein the write pole has first and second sides, and wherein the non-magnetic layer covers the sides of the write pole in an exposed portion of the pole tip portion, and wherein the non-magnetic layer has a thickness at the sides of the write pole in the pole tip region that is larger than the thickness at the front edge of the stitched flare portion.
3. A write head as in claim 1 further comprising a magnetic shield formed over at least a portion of the write pole and the non-magnetic layer.