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US 6,954,340 B2Granted
Perpendicular magnetic recording head with nonmagnetic write gap greater than twice side shield gap distance
AssigneeSeagate Technology LLC
InventorsAlexander M. Shukh, Ned Tabat
Life of this patent
Estimating the term…
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.
Claims29
An apparatus comprising:
- a magnetic read element;
- a perpendicular magnetic recording write element, said magnetic write element including a main pole, first and second spaced apart side shields, and a first return pole, wherein said main pole is positioned between said first and second side shields, said first return pole and said main pole each having a proximal and a distal end;
- and
- wherein said first side shield and said second side shield are positioned at a distance Gs from said proximal end of said main pole, said main pole and said first return pole are separated by a nonmagnetic write gap, said nonmagnetic write gap being a distance G, and further wherein the distance G is greater than twice the distance Gs.
1 more element
An apparatus comprising:
- a magnetic read element;
- and
- a magnetic write element including a main pole, a first return pole positioned adjacent of said main pole thereby forming a nonmagnetic write gap, a first and second spaced apart side shield positioned on either side of said main pole, wherein said main pole has a leading edge and trailing edge, said leading edge sized dimensionally smaller than said trailing edge, further wherein said first side shield and said second side shield are positioned at a distance Gs from said main pole, said nonmagnetic write gap being a distance G, and further wherein the distance G is greater than twice the distance Gs.
An apparatus comprising:
- a magnetic write element comprising a main pole, first and second spaced apart side shields, and a first return pole, wherein said main pole is positioned between said first and second side shields, said first return pole having a proximal and distal end, said proximal end of said first return pole is adjacent said main pole and said first and second side shields, wherein said first side shield and said second side shield are positioned at a distance Gs from a proximal end of said main pole, said main pole and said first return pole are separated by a nonmagnetic write gap, said nonmagnetic write gap being a distance G, and further wherein the distance G is greater than twice the distance Gs;
- and
- a magnetic recordable medium comprising a thin top layer and a bottom layer, said main pole of said write element and said bottom layer of said medium separated by a distance D, further wherein the distance G is greater than twice the distance D and the distance G8 is approximately equal to the distance D.
Dependencies are inferred from the claim text.