Magnetic writer having convex trailing surface pole and conformal write gap

Abstract

A magnetic write apparatus has a media-facing surface (MFS), a pole, a write gap, a top shield and coil(s). The pole includes a yoke and a pole tip. The pole tip includes a bottom, a top wider than the bottom and first and second sides. The pole tip has a height between the top and the bottom. At least part of the top of the pole tip is convex in a cross-track direction between the first and second sides such that the height at the MFS is larger between the first and second sides than at the first and second sides. The height increases in a yoke direction perpendicular to the MFS. The write gap is adjacent to and conformal with the top of the pole at the MFS and is between part of the top shield and the pole. The top shield is concave at the MFS.

What is claimed is: 
     
         1 . A magnetic write apparatus comprising:
 a pole comprising a pole tip and a yoke, the pole tip comprising:
 a bottom extending parallel to a cross track direction; 
 a top extending in the cross track direction and wider than the bottom; 
 a first side extending between the top and the bottom in a down track direction; and 
 a second side extending in the down track direction between the top and the bottom, 
   wherein at a media facing surface, the pole tip forms a first angle at the first side between the top and a plane extending along the cross track direction and a second angle at the second side between the top and the plane;   wherein a value of the first angle is different from a value of the second angle; and   wherein the down track direction is parallel to the media facing surface and the cross track direction is perpendicular to the down track direction.   
     
     
         2 . The magnetic write apparatus of  claim 1 , wherein the top has a convex curved surface. 
     
     
         3 . The magnetic write apparatus of  claim 1 , wherein the top has a convex peaked surface. 
     
     
         4 . The magnetic write apparatus of  claim 1 , wherein the pole tip has a height between the top and the bottom, and wherein the height increases from the media facing surface in a yoke direction that is perpendicular to the media facing surface. 
     
     
         5 . The magnetic write apparatus of  claim 1 , wherein the pole tip has a maximum height between the first side and a center of the first side and the second side along the top, and wherein the first angle is greater than the second angle. 
     
     
         6 . The magnetic write apparatus of  claim 1 , wherein the pole tip has a width between the first side and the second side, and wherein the width increases from the media facing surface in a yoke direction that is perpendicular to the media facing surface. 
     
     
         7 . The magnetic write apparatus of  claim 1 , wherein the first angle is greater than zero degrees and not more than twenty degrees. 
     
     
         8 . The magnetic write apparatus of  claim 1 , wherein the second angle is greater than zero degrees and not more than twenty degrees. 
     
     
         9 . The magnetic write apparatus of  claim 1 , further comprising a write gap that is conformal with a shape of the top in the cross track direction. 
     
     
         10 . The magnetic write apparatus of  claim 9 , wherein the write gap comprises overhangs that extend past the first side and the second side of the pole tip. 
     
     
         11 . The magnetic write apparatus of  claim 9 , further comprising an additional gap extending along the first side and the second side, and wherein the write gap does not extend beyond the additional gap. 
     
     
         12 . The magnetic write apparatus of  claim 1 , wherein the pole tip forms a third angle at the first side between the top and the plane at a position recessed from the media facing surface, and wherein a value of the third angle is equal to the value of the first angle. 
     
     
         13 . The magnetic write apparatus of  claim 1 , wherein the pole tip forms a fourth angle at the second side between the top and the plane at a position recessed from the media facing surface, and wherein a value of the fourth angle is equal to the value of the second angle. 
     
     
         14 . The magnetic write apparatus of  claim 1 , wherein the pole tip forms a third angle at the first side between the top and the plane at a position recessed from the media facing surface, and wherein a value of the third angle is less than the value of the first angle. 
     
     
         15 . The magnetic write apparatus of  claim 1 , wherein the pole tip forms a fourth angle at the second side between the top and the plane at a position recessed from the media facing surface, and wherein a value of the fourth angle is less than the value of the second angle. 
     
     
         16 . A magnetic write apparatus comprising:
 a pole comprising a pole tip, the pole tip comprising:
 a top extending in a cross track direction and having a first side and a second side; 
   wherein at a media facing surface, the pole tip forms a first angle at the first side between the top and a plane extending along the cross track direction and a second angle at the second side between the top and the plane; and   a write gap that is conformal with a shape of the top,   wherein a value of the first angle is different from a value of the second angle at the media facing surface; and   wherein the cross track direction is perpendicular to a down track direction and the down track direction is parallel to the media facing surface.   
     
     
         17 . The magnetic write apparatus of  claim 16 , wherein the first angle and the second angle decrease continuously from the media facing surface in a yoke direction that is perpendicular to the media facing surface. 
     
     
         18 . The magnetic write apparatus of  claim 16 , wherein the first angle and the second remain constant in a yoke direction that is perpendicular to the media facing surface. 
     
     
         19 . A magnetic write apparatus comprising:
 a pole comprising a pole tip, the pole tip comprising:
 a bottom extending parallel to a cross track direction; 
 a top extending in the cross track direction; 
 a first side extending between the top and the bottom in a down track direction; and 
 a second side extending in the down track direction between the top and the bottom, 
   wherein the pole tip has a height between the top and the bottom, and the height increases from a media facing surface in a yoke direction that is perpendicular to the media facing surface;   wherein the pole tip has a width between the first side and the second side, and the width increases from the media facing surface in the yoke direction;   wherein at the media facing surface, the pole tip forms a first angle at the first side between the top and a plane that extends along the cross track direction and a second angle at the second side between the top and the plane;   wherein a value of the first angle is different from a value of the second angle; and   wherein the down track direction is parallel to the media facing surface and the cross track direction is perpendicular to the down track direction.   
     
     
         20 . The magnetic write apparatus of  claim 19 , wherein each of the first angle and the second angle is greater than zero degrees and not more than twenty degrees.