US Patent No: 7,336,441

Number of patents in Portfolio can not be more than 2000

Yoke structure with a step

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Importance

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Abstract

A planar top yoke in a magnetic write head is disclosed. The top yoke includes a backside region and a second pole tip region that is thinner than the backside region and forms a step at the ABS. Alternatively, a front section of the backside region includes a step with a thickness greater than the second pole tip region. Therefore, flux is directed from a thicker backside region toward the gap side of the second pole tip layer near the ABS. A lower flux density is formed at the top of the step at the ABS which reduces the flank field/gap field ratio and prevents unwanted erasure of adjacent data tracks. A high gap field is achieved while maintaining a low flank field during high write current conditions. The step recess from the ABS toward the backside region is about 0.2 to 2 microns.

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First Claim

Related Publications

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HEADWAY TECHNOLOGIES, INC.MILPITAS, CA686

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Takano, Kenichi Cupertino, CA 72 148

Cited Art

Patent Info (Count) # Cites Year
 
HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V. (4)
6,029,339 Method of making write head with recessed stitched yoke on a planar portion of an insulation layer defining zero throat height 21 1998
6,111,724 Method of making a magnetic write head with plated self-aligned zero throat height defining layer without reflective notching of a second pole tip 48 1998
6,337,783 Write head with multi-stitched second pole piece 29 1998
6,473,276 Merged magnetic head which includes a write head with single-sided notched first pole piece 6 2000
 
SEAGATE TECHNOLOGY LLC (1)
6,504,675 Perpendicular magnetic recording heads with write pole shaped to reduce skew effects during writing 127 2001
 
TDK CORPORATION (1)
6,668,442 Method of manufacturing a thin film magnetic head 11 2001

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
WESTERN DIGITAL (FREMONT), LLC (1)
8,405,930 Method and system for providing a transducer having dual, ABS recessed auxiliary poles on opposite sides of a main pole with non-magnetic spacer adjoining back portion of main pole and positioned between auxiliary poles 0 2011

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