Perpendicular magnetic recording head with nonmagnetic write gap greater than twice side shield gap distance
View Patent ↗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.
1. 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 G s 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 G s .
2. The apparatus as recited in claim 1 , wherein a trailing edge of said main Dole is substantially straight.
3. The apparatus as recited in claim 1 , wherein a side connecting a leading edge and a trailing edge of said main pole defines at least one slope angle equal to or greater than a maximum skew angle of said write element.
4. The apparatus as recited in claim 1 , wherein said proximal end of said first return pole is adjacent said main pole and said first and second side shields, said first return pole and said main pole connected to a back magnetic stud, and a plurality of insulated coils surrounding the e magnetic stud.
5. The apparatus as recited in claim 1 , wherein said first return pole also functions as a bottom shield.
6. The apparatus as recited in claim 5 , wherein the first return pole also functions as a leading pole.
7. The apparatus as recited in claim 1 , wherein said apparatus includes a magnetic recordable medium, said magnetic recordable medium includes 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, wherein the distance G is greater than twice the distance D and the distance G s is approximately equal to or greater than the distance D.
8. The apparatus as recited in claim 7 , wherein a position on said magnetic recordable medium rotates under said write element prior to rotating under said read element.
9. The apparatus as recited in claim 7 , wherein a position on said magnetic recordable medium rotates under said read element prior to rotating under said write element.
10. The apparatus as recited in claim 7 , wherein said main pole further includes a second return pole, said second return pole having a proximal and distal end, said proximal end of said first return pole being proximate said magnetic recordable medium and adjacent said main pole and said first and second side shields, further wherein a magnetic core is positioned between said distal ends of said second return pole and said first return pole, and further wherein said distal end of said main pole is positioned within a portion of said magnetic core.
11. The apparatus as recited in claim 10 , wherein said main pole includes a leading write gap G l adjacent said first return pole and a trailing write gap G t adjacent said second return pole, further wherein the distance G l is greater than four times the distance D and the distance G t is greater than two times the distance D.
12. 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 G s from said main pole, said nonmagnetic write gap being a distance G, and further wherein the distance G is greater than twice the distance G s .
13. The apparatus as recited in claim 12 , wherein said write element includes a second return pole and a magnetic core, said second return pole positioned downstream said main pole and said magnetic core is positioned between a rear portion of said first return pole and said second return pole, and further wherein a rear portion of said main pole is positioned within a portion of said magnetic core.
14. The apparatus as recited in claim 12 , wherein said trailing edge is substantially straight.
15. The apparatus as recited in claim 13 , wherein a side connecting said leading edge and said trailing edge defines at least one slope angle equal to or greater than a maximum skew angle on said magnetic write element.
16. The apparatus as recited in claim 12 , wherein said first return pole is adjacent said main pole and said first and second side shields said first return pole and said main pole connected to a back magnetic stud, and a plurality of insulated coils surrounding the magnetic stud.
17. The apparatus as recited in claim 12 , further comprising a magnetic recordable medium comprising a thin top layer and a bottom layer.
18. The apparatus as recited in claim 17 , wherein said main pole of said write element and said bottom layer of said medium are separated by a distance D, wherein the distance G is greater than twice the distance D and the distance G s is approximately equal to the distance D.
19. The apparatus as recited in claim 12 , wherein a position on said magnetic recordable medium rotates under said magnetic read element prior to rotating under said magnetic write element, further wherein the distance G is greater than four times the distance D.
20. 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 G s 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 G s ; 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 G 8 is approximately equal to the distance D.
21. The apparatus as recited in claim 20 , further comprising a plurality of insulated coils surrounding a magnetic core positioned between distal ends of said main pole and said first return pole.
22. The apparatus as recited in claim 20 , wherein said main pole has a leading edge and trailing edge, said leading edge sized dimensionally smaller than said trailing edge.
23. The apparatus as recited in claim 22 , wherein the first return pole functions as a bottom shield.
24. The apparatus as recited in claim 22 , wherein said trailing edge is substantially straight.
25. The apparatus as recited in claim 24 , wherein a side connecting said leading edge and said trailing edge defines at least one slope angle equal to or greater than a maximum skew angle on said magnetic write element.
26. The apparatus as recited in claim 22 , wherein a position on said magnetic recordable medium rotates under said magnetic write element prior to rotating under a magnetic read element.
27. The apparatus as recited in claim 23 , wherein a position on said magnetic recordable medium rotates under a magnetic read element prior to rotating under said magnetic write element, further wherein the first return pole functions as the leading pole.
28. The apparatus as recited in claim 20 , wherein said main pole further includes a second return pole, said second return pole having a proximal and distal end, said proximal end of said first return pole being proximate said magnetic recordable medium and adjacent said main pole and said first and second side shields further wherein a magnetic core is positioned between said distal ends of said second return pole and said first return pole, and further wherein a distal end of said main pole is positioned within a portion of said magnetic core.
29. The apparatus as recited in claim 28 , wherein said main pole includes a leading write gap G l adjacent said first return pole and a trailing write gap G l adjacent said second return pole, further wherein the distance G l is greater than four times the distance D and the distance G t is greater than two times the distance D.