Patent Number: 7,821,737

Title: Thin film magnetic head for high density recording and having a leading side magnetic pole piece of variable width at the media facing surface

Abstract: Embodiments of the invention provide a thin film magnetic head suitable for high density recording having a small erase band .DELTA.E and a small fringe magnetic field, and a large recording magnetic field. In one embodiment, a width LW of a lower magnetic pole piece protuberance of a leading side magnetic pole piece, at a face in contact with a write gap layer, is made smaller than a width TW of an upper magnetic pole piece front layer of a trailing side magnetic pole piece, at a face in contact with the write gap layer, and the width of the lower magnetic pole piece protuberance adjacent to the write gap layer is made larger, in a direction from the write gap layer.

Inventors: Ohtomo; Shigekazu (Saitama, JP), Fukui; Hiroshi (Ibaraki-ken, JP), Yokoyama; Toshimi (Tokyo, JP)

Assignee: Hitachi Global Storage Technologies Netherlands B.V.

International Classification: G11B 5/187 (20060101)

Expiration Date: 2018-10-26 0:00:00