PMR Write Head with Patterned Leading Edge Taper
First Claim
1. A perpendicular magnetic recording (PMR) writer, comprising:
- (a) a main pole with a first leading side and a trailing side, and two sides that connect the first leading side with the trailing side, the first leading side adjoins a lead gap having a front side at an air bearing surface (ABS), and the trailing side has a track width at the ABS;
(b) the lead gap that separates the first leading side and a leading shield; and
(c) the leading shield with a lower layer having a first cross-track width (w), and a backside at a first height (c) from a front side thereof at the ABS, and an upper layer formed on a top surface of the lower layer wherein the upper layer comprises;
(1) a front side having the first cross-track width (w) at the ABS;
(2) a second side contacting the lead gap, the second side is formed substantially parallel to the first leading side and has a front end at the ABS and a back end at the first height from the ABS, and wherein the second side comprises a notch that is recessed a second height (a) from the ABS and has a second cross-track width (w1) between two notch sidewalls that are equidistant from a center plane that bisects the leading shield and the main pole, and where w1<
w, and wherein the notch has a first notch side that is formed parallel to the ABS and has a first down-track thickness, and the notch has a second notch side that extends from an end of the first notch side to a backside of the upper layer at the first height, and wherein each of the two notch sidewalls intersect the first notch side at an angle from about 90 to 170 degrees such that a distance between the two notch sidewalls at the upper layer backside is ≥
w1 where w1 is the cross-track width at the second height; and
(3) the backside that is aligned parallel to the ABS.
1 Assignment
0 Petitions
Accused Products
Abstract
A PMR writer is disclosed with an all wrap around (AWA) shield design in which a surface of the leading shield that contacts the lead gap is comprised of a notch that is recessed 20 to 120 nm from the air bearing surface (ABS) and has a first side with a down-track dimension of 20-200 nm that is aligned parallel to the ABS. In one embodiment, the notch is aligned below the main pole leading side and has a cross-track width substantially the same as the track width of the main pole trailing side. The notch has two sidewalls formed equidistant from a center plane that bisects the leading shield wherein each sidewall intersects the first side at an angle of 90 to 170 degrees. As a result, overwrite and bit error rate are improved while adjacent track interference and tracks per square inch capability are substantially maintained.
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Citations
22 Claims
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1. A perpendicular magnetic recording (PMR) writer, comprising:
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(a) a main pole with a first leading side and a trailing side, and two sides that connect the first leading side with the trailing side, the first leading side adjoins a lead gap having a front side at an air bearing surface (ABS), and the trailing side has a track width at the ABS; (b) the lead gap that separates the first leading side and a leading shield; and (c) the leading shield with a lower layer having a first cross-track width (w), and a backside at a first height (c) from a front side thereof at the ABS, and an upper layer formed on a top surface of the lower layer wherein the upper layer comprises; (1) a front side having the first cross-track width (w) at the ABS; (2) a second side contacting the lead gap, the second side is formed substantially parallel to the first leading side and has a front end at the ABS and a back end at the first height from the ABS, and wherein the second side comprises a notch that is recessed a second height (a) from the ABS and has a second cross-track width (w1) between two notch sidewalls that are equidistant from a center plane that bisects the leading shield and the main pole, and where w1<
w, and wherein the notch has a first notch side that is formed parallel to the ABS and has a first down-track thickness, and the notch has a second notch side that extends from an end of the first notch side to a backside of the upper layer at the first height, and wherein each of the two notch sidewalls intersect the first notch side at an angle from about 90 to 170 degrees such that a distance between the two notch sidewalls at the upper layer backside is ≥
w1 where w1 is the cross-track width at the second height; and(3) the backside that is aligned parallel to the ABS. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11)
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8. (canceled)
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12. A perpendicular magnetic recording (PMR) writer, comprising:
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(a) a main pole with a first leading side and a trailing side, and two sides that connect the first leading side with the trailing side, the first leading side adjoins a lead gap having a front side at an air bearing surface (ABS), and the trailing side has a track width at the ABS; (b) the lead gap that separates the first leading side and a leading shield; and (c) the leading shield with a lower layer having a first cross-track width (w) between a first far side and a second far side, and a backside at a first height (c) from a front side thereof at the ABS, and an upper layer formed on a top surface of the lower layer wherein the upper layer comprises; (1) a front side having the first cross-track width (w) at the ABS; (2) a second side contacting the lead gap, the second side is formed substantially parallel to the first leading side and has a front end at the ABS and a back end at the first height from the ABS, and wherein the second side comprises a curved notch having a curved section with a front portion that is recessed a second height (a) from the ABS, and wherein the curved notch has a second cross-track width (w1) between two sidewalls that are equidistant from a center plane that bisects the leading shield and the main pole, and where w1<
w, and wherein the curved notch extends from the second side to a backside of the upper layer at the first height; and(3) the backside that is aligned parallel to the ABS, and wherein the upper layer backside on each side of the notch is parallel to the ABS between the first and second far sides. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22-31. -31. (canceled)
Specification