US Patent No: 6,954,340

Number of patents in Portfolio can not be more than 2000

Perpendicular magnetic recording head with nonmagnetic write gap greater than twice side shield gap distance

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ALSO PUBLISHED AS: 20020176214
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Importance

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Abstract

A magnetic head for perpendicular recording on double layer media with suppressed side writing and controlled write width is disclosed. The present invention reduces the problem of side writing and controls the write width of the writing element by providing a writing element with a trailing edge sized dimensionally larger than the leading edge, side shields, and specifically spaced writing gaps placed at various distances between the write element and the side shields, return poles, and the main pole.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SEAGATE TECHNOLOGY LLCSCOTTS VALLEY, CA5152

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Shukh, Alexander M Savage, MN 16 314
Tabat, Ned Chanhassen, MN 14 156

Cited Art

Patent Info (Count) # Cites Year
 
MKE-QUANTUM COMPONENTS COLORADO LCC (2)
4,656,546 Vertical magnetic recording arrangement 142 1985
4,935,832 Recording heads with side shields 65 1988
 
SEAGATE TECHNOLOGY LLC (2)
6,504,675 Perpendicular magnetic recording heads with write pole shaped to reduce skew effects during writing 128 2001
6,707,642 Longitudinal magnetic recording head with reduced side fringing 7 2001
 
SUMITOMO SPECIAL METALS CO., LTD. (1)
5,181,151 Thin-film perpendicular magnetic recording and reproducing head having thin magnetic shield film on side surfaces 10 1991
 
TDK CORPORATION (1)
6,631,054 Thin film magnetic head, a magnetic head device, a magnetic disk drive device, and a method for manufacturing a thin film magnetic device 16 2001

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
HGST NETHERLANDS B.V. (17)
7,969,683 Write first design for a perpendicular thin film head 0 2003
7,388,732 Perpendicular recording magnetic head with a write shield megnetically coupled to a first pole piece 4 2004
7,639,450 Flux shunt structure for reducing return pole corner fields in a perpendicular magnetic recording head 0 2005
7,551,396 Perpendicular magnetic write head having a studded trailing shield compatible with read/write offset 6 2005
7,477,481 Bilayer trailing shield gap for perpendicular head 7 2005
8,203,803 Magnetic recording head for perpendicular recording with wrap around shield, the fabrication process and magnetic disk storage apparatus mounting the magnetic head 0 2005
7,450,349 Magnetic head with soft magnetic shield and magnetic storage 5 2005
7,576,951 Perpendicular magnetic write head having a magnetic write pole with a concave trailing edge 7 2006
7,894,159 Perpendicular write head with independent trailing shield designs 6 2007
7,990,653 Perpendicular recording magnetic head with a main magnetic pole piece and an auxiliary magnetic pole piece 3 2007
7,950,137 Method for manufacturing a magnetic write head 0 2007
8,120,874 Perpendicular write head having a modified wrap-around shield to improve overwrite, adjacent track interference and magnetic core width dependence on skew angle 5 2007
8,164,987 Thermally assisted magnetic head 0 2008
8,347,488 Magnetic write head manufactured by damascene process producing a tapered write pole with a non-magnetic step and non-magnetic bump 0 2009
8,201,320 Method for manufacturing a magnetic write head having a wrap around shield that is magnetically coupled with a leading magnetic shield 4 2009
8,230,583 Method for manufacturing a magnetic write head 0 2009
7,952,831 Perpendicular magnetic recording write head with notched trailing shield 1 2010
 
SAE MAGNETICS (H.K.) LTD. (11)
7,508,630 Thin film magnetic head and method of manufacturing the same 2 2006
7,940,495 Magnetic head for perpendicular magnetic recording 7 2006
8,400,732 Perpendicular magnetic write head, having side shields coupled to a leading shield and apart from a trailing shield 0 2007
8,218,264 Magnetic head for perpendicular magnetic recording having a main pole and two shields 1 2010
8,213,116 Magnetic head for perpendicular magnetic recording 0 2011
8,345,382 Magnetic head for perpendicular magnetic recording having a main pole and a shield and specifically structured and located coil elements and magnetic coupling layers 0 2011
8,295,008 Magnetic head for perpendicular magnetic recording having a main pole and a shield 4 2011
8,441,755 Magnetic head for perpendicular magnetic recording having a main pole, a shield and a coil core part setback away from the medium facing surface a specified distance 0 2011
8,300,357 Magnetic head for perpendicular magnetic recording having a main pole and a shield 2 2011
8,345,381 Magnetic head for perpendicular magnetic recording having a return path section 1 2012
8,427,782 Magnetic head for perpendicular magnetic recording 0 2012
 
SEAGATE TECHNOLOGY LLC (9)
7,233,457 Head for perpendicular recording with reduced erasure 15 2003
7,397,633 Writer structure with assisted bias 24 2005
7,573,683 Write heads with floating side shields and manufacturing methods 14 2006
7,876,531 Virtual front shield writer 2 2007
8,310,782 Dedicated ID-OD writer with beveled pole tips and method of manufacture 0 2008
7,907,360 Setting writer boundaries for multiple writers 0 2008
8,149,537 Magnetic writer with multi-component shield 1 2009
8,365,393 Manufacturing methods for write heads with floating side shields 0 2009
8,289,647 Magnetic recording head with notched shield 0 2010
 
TDK CORPORATION (8)
7,542,233 Perpendicular magnetic recording element, thin film magnetic head, magnetic head device, and magnetic recording/reproducing apparatus for reducing deleterious effects of external magnetic fields 2 2006
7,995,308 Magnetic head for perpendicular magnetic recording and method of manufacturing same, the magnetic head incuding pole layer and two shields sandwiching the pole layer 1 2007
8,040,633 Magnetic head and magnetic recording-reproducing apparatus 1 2007
8,000,064 Thin-film magnetic head for perpendicular magnetic recording and method of making the same 1 2007
8,243,386 Perpendicular magnetic recording head with bottom shield layer 0 2008
8,238,057 Magnetic head, head assembly and magnetic recording/reproducing apparatus and method for manufacturing magnetic head 0 2009
8,117,737 Method of manufacturing magnetic head for perpendicular magnetic recording with shield around main magnetic pole 1 2009
8,323,517 Method of forming magnetic pole section of perpendicular magnetic recording type thin-film magnetic head and manufacturing method of perpendicular magnetic recording type thin-film magnetic head 0 2010
 
Western Digital (Fremont), LLC (6)
7,337,530 Method for manufacturing a shielded pole magnetic head for perpendicular recording 8 2007
8,015,692 Method for providing a perpendicular magnetic recording (PMR) head 17 2007
8,166,632 Method for providing a perpendicular magnetic recording (PMR) transducer 2 2008
8,276,258 Method for fabricating a magnetic recording transducer 1 2008
8,166,631 Method for fabricating a magnetic recording transducer having side shields 7 2008
8,231,796 Method and system for providing a magnetic recording transducer having side shields 1 2008
 
HEADWAY TECHNOLOGIES, INC. (5)
7,872,835 Optimized write pole flare angle for side shield or semi side shield PMR writer application 10 2007
7,804,666 Composite shield structure of PMR writer for high track density 9 2007
8,035,930 Perpendicular magnetic recording write head with a side shield 2 2007
8,289,649 Magnetic head for perpendicular magnetic recording with shield around main magnetic pole 0 2010
8,094,419 Optimized write pole flare angle for side shield or semi side shield PMR writer application 2 2011
 
KABUSHIKI KAISHA TOSHIBA (4)
7,394,620 Perpendicular magnetic recording head and magnetic disc apparatus 6 2004
8,169,741 Perpendicular magnetic recording head with side shield and magnetic disk apparatus 2 2007
8,363,346 Magnetic head and disk drive with same 0 2011
8,315,015 Perpendicular magnetic recording head provided with side shield and magnetic disk apparatus using the same 0 2012
 
SAMSUNG ELECTRONICS CO., LTD. (3)
7,573,676 Magnetic recording head having a pole structure formed on a same plane as and surrounded by a shield for reducing an antenna effect 0 2005
7,903,372 Magnetic recording head and method of manufacturing the same 1 2006
8,042,259 Method of manufacturing a magnetic recording head 0 2010
 
WESTERN DIGITAL (FREMONT), INC. (3)
7,126,788 Trailing edge recording magnetic head with reversed double bias coil and deflection pole for perpendicular recording with a non-perpendicular write field 10 2003
7,126,790 Magnetic head for perpendicular recording with magnetic loop providing non-perpendicular write field 10 2003
7,193,815 Shielded pole magnetic head for perpendicular recording 16 2004
 
HITACHI, LTD. (1)
7,969,691 Magnetic head and magnetic disk system having a read sensor and a sensing current 0 2008
 
SEIKO INSTRUMENTS INC. (1)
8,284,636 Near-field thermally assisted magnetic recording head and recording apparatus thereof 0 2007

Maintenance Fees

Fee Large entity fee small entity fee micro entity fee due date
7.5 Year Payment $3600.00 $1800.00 $900.00 Apr 11, 2013
11.5 Year Payment $7400.00 $3700.00 $1850.00 Apr 11, 2017
Fee Large entity fee small entity fee micro entity fee
Surcharge - 7.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge after expiration - Late payment is unavoidable $700.00 $350.00 $175.00
Surcharge after expiration - Late payment is unintentional $1,640.00 $820.00 $410.00