Abstract: As track densities increase, it becomes increasingly important, while writing in a given track, not to inadvertently write data in adjoining tracks. This problem has been overcome by limiting the width of material in the ABS plane to what it is at the write gap. The part of the lower pole that is wider than this is recessed back away from the ABS, thereby greatly reducing its magnetic influence on adjacent tracks. Four different embodiments of write heads that incorporate this notion are described together with a description of a general process for their manufacture.
Type:
Grant
Filed:
February 6, 2012
Date of Patent:
August 26, 2014
Assignee:
Headway Technologies, Inc.
Inventors:
Moris Dovek, Glen Garfunkel, Po Kang Wang
Abstract: As track densities increase, it becomes increasingly important, while writing in a given track, not to inadvertently write data in adjoining tracks. This problem has been overcome by limiting the width of material in the ABS plane to what it is at the write gap. The part of the lower pole that is wider than this is recessed back away from the ABS, thereby greatly reducing its magnetic influence on adjacent tracks. Four different embodiments of write heads that incorporate this notion are described together with a description of a general process for their manufacture.
Type:
Grant
Filed:
February 6, 2012
Date of Patent:
July 1, 2014
Assignee:
Headway Technologies, Inc.
Inventors:
Moris Dovek, Glen Garfunkel, Po Kang Wang
Abstract: As track densities increase, it becomes increasingly important, while writing in a given track, not to inadvertently write data in adjoining tracks. This problem has been overcome by limiting the width of material in the ABS plane to what it is at the write gap. The part of the lower pole that is wider than this is recessed back away from the ABS, thereby greatly reducing its magnetic influence on adjacent tracks. Four different embodiments of write heads that incorporate this notion are described together with a description of a general process for their manufacture.
Type:
Grant
Filed:
February 6, 2012
Date of Patent:
September 24, 2013
Assignee:
Headway Technologies, Inc.
Inventors:
Moris Dovek, Glen Garfunkel, Po Kang Wang
Abstract: A magnetic head includes a first pole piece; a second pole piece; a pedestal formed over a central portion of the first pole piece; a gap separating the pedestal from the second pole piece; and at least one of a top straight walled portion over the pedestal and a bottom straight-walled portion underneath the pedestal, the pedestal being notched with angled side walls.
Type:
Grant
Filed:
March 11, 2008
Date of Patent:
February 10, 2009
Assignee:
International Business Machines Corporation
Inventors:
Wen-Chein David Hsiao, Jyh-Shuey Jerry Lo
Abstract: A trimmed upper pole piece for a magnetic write head, said pole piece having a tapered profile that is widest at its trailing edge. Such a pole piece is capable of writing narrow tracks with sharply and well defined patterns and minimal overwriting of adjacent tracks. The necessary taper is produced by using NiCr, NiFeCr, Rh or Ru as write gap filling materials which have an etch rate which is substantially equal to the etch rate of the other layers forming the pole piece and are highly corrosion resistant. As a result, the write gap does not protrude to mask the effects of the ion-beam etch used to form the taper.
Type:
Grant
Filed:
September 16, 2005
Date of Patent:
June 3, 2008
Assignee:
Headway Technologies, Inc.
Inventors:
Cherng-Chyi Han, Mao-Min Chen, Po Kang Wang, Fenglin Liu