Four sided shield structure for a perpendicular write head
AssigneeDialog Semiconductor GmbH
InventorsLijie Guan, Yaw Tang, Hung Hu
Life of this patent
Estimating the term…
Abstract
The traditional single pole perpendicular writer has two major problems—insufficient field gradient in the down track direction and adjacent track erasure (ATE) caused by side fringing fields. These problems have been overcome by tapering the main pole and then shielding it on all four sides.
Claims30
A method for reducing fringe fields from a perpendicular write head having an air bearing surface, a write pole with a length and a first width, a leading shield, and a return pole with a second width, comprising:
- tapering said write pole so as to have increasing width in a direction away from the air bearing surface;
- symmetrically locating a trailing shield, whose bottom surface is coplanar with the air bearing surface at a first distance behind said write pole;
- at second distances from opposing edges of the write pole, placing a pair of side shields that contact said trailing shield, that have bottom surfaces coplanar with the air bearing surface, said side shields having opposing outer edges separated by an amount equaling said second width, whose widths exceed said the write pole length by an amount;
- and
- magnetically connecting said side shields to said return pole.
A shield for a perpendicular write head having an air bearing surface, a write pole with a length and a first width, a leading shield, and a return pole with a second width, comprising:
- said write pole being tapered so that its width increases with increasing distance from the air bearing surface;
- a trailing shield, whose bottom surface is coplanar with the air bearing surface and that has a first width, symmetrically located at a first distance behind said write pole;
- a pair of side shields, that contact said trailing shield and that have bottom surfaces coplanar with the air bearing surface, located a second distance from opposing edges of the write pole, said side shields having opposing outer edges separated by an amount equaling said second width, and widths that exceed the length of the write pole by an amount;
- and
- said side shields being magnetically connecting to said return pole.
Dependencies are inferred from the claim text.