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US 7,133,253 B1Granted
Pole tip with sides flared at media-facing surface
AssigneeWestern Digital (Fremont), LLC
InventorsDavid J. Seagle, G. Vinson Kelley
Life of this patent
Estimating the term…
Abstract
A thin film electromagnetic head has an inductive transducer with a ferromagnetic pole layer terminating adjacent a media-facing surface at a pole tip surface. The pole layer has side surfaces each having an end region that meets the pole tip surface, the end regions increasingly separated with increasing distance from the pole tip surface. Having a pole layer that is tapered to the point at which it meets the pole tip surface channels flux more efficiently for writing on-track as opposed to off-track. Such a tapered pole tip can be formed for a pair of pole layers separated by a submicron nonferromagnetic gap, or for a single perpendicular writing pole layer.
Claims28
A device comprising:
- a solid body extending from a media-facing surface in a first direction, extending from a leading end to a trailing end in a second direction that is perpendicular to said first direction, and extending in a third direction that is perpendicular to said first and second directions;
- an electrically conductive coil disposed in said body and including a plurality of adjacent coil sections oriented substantially parallel to each other;
- and
- first and second ferromagnetic pole layers disposed in said body, each having a thickness of less than ten microns and separated from each other in said second direction, said first ferromagnetic pole layer having a substantially flat first face disposed adjacent to said media-facing surface and extending a first distance in said third direction, said second ferromagnetic pole layer having a substantially flat second face disposed adjacent to said media-facing surface and extending in said third direction a second distance not substantially greater than said first distance, said second face having first and second sides that are separated in said third direction, said first side meeting said second face at an angle between said first direction and said third direction, wherein said first and second sides each extend in a substantially straight line from said second face for a distance of at least one micron;
- wherein said angle is in a range between twenty degrees and sixty degrees from said first direction.
2 more elements
A device comprising:
- a solid body having a leading end, a trailing end, and a media-facing surface, said solid body extending in a longitudinal direction from said leading end to said trailing end;
- an electrically conductive coil disposed in said body and including a plurality of adjacent coil sections oriented substantially parallel to each other;
- and
- a leading ferromagnetic pole layer and a trailing ferromagnetic pole layer, each having a thickness of less than ten microns, said leading pole layer having a leading face and said trailing layer having a trailing face, said leading and trailing faces being disposed adjacent to said media-facing surface, said trailing ferromagnetic layer having side surfaces each having an end region that meets said trailing face, said end regions being substantially parallel to said longitudinal direction but not parallel to each other, wherein said trailing face restricts a track width written by the device and said side surfaces each extending in a substantially straight line from said trailing face for a distance of at least one micron;
- wherein at least one of said end regions extends from said trailing face at an angle from normal to said trailing face that is in a range between twenty degrees and sixty degrees.
2 more elements
A device comprising:
- a solid body having a leading end, a trailing end, and a media-facing surface, said solid body extending in a longitudinal direction from said leading end to said trailing end;
- a ferromagnetic leading pole layer having a thickness of less than ten microns;
- and
- a ferromagnetic trailing pole layer having a thickness of less than ten microns, a substantially planar trailing pole tip surface disposed adjacent to said media-facing surface, a first side surface having a first end region meeting said trailing pole tip surface, and a second side surface having a second end region meeting said trailing pole tip surface, wherein said first and second end regions are separated from each other by a track width at said trailing pole tip surface and by an extent that increases with increased distance from said trailing pole tip surface, and said first and second side surfaces each extends in a substantially straight line from said trailing face for a distance of at least one micron;
- wherein said first and second end regions diverge from one another at an angle as they extend away from the pole tip surface, and said angle is in a range between about 40 degrees and 120 degrees.
2 more elements
Dependencies are inferred from the claim text.