PMR write head with modified main pole shape to minimize adjacent track interference

A magnetic writer comprising:

• A main pole tapering to a narrow pole tip at an air bearing surface (ABS);
• A pair of side shields, mirror-symmetrically disposed to either side of said pole tip, wherein each of said pair of side shields has a face that is coplanar with said ABS and surrounding said pole tip;
• wherein said side shields are separated from said pole tip by a gap;
• wherein a peripheral shape of a horizontal cross-section of said main pole is a triangle, symmetric about a centerline, tapering towards said ABS, interrupted by two symmetrical, horizontally co-linear projections that extend from each lateral side beyond said triangular periphery;
• wherein a bar-shaped element passes horizontally completely through said main pole, parallel to said ABS, thereby creating said horizontally co-linear projections;
• wherein said bar-shaped element is positioned at a perpendicular distance, denoted d_ABS, from said ABS.

A method of forming a magnetic writer, comprising:

• forming a main magnetic pole having a substantially triangular horizontal cross-sectional periphery that is symmetric about a centerline and that tapers towards an ABS at which point it forms a pole tip;
• then
• forming a horizontal bar-shaped element within said main magnetic pole, transverse to said centerline and at a distance d_ABS above said ABS;
• wherein said horizontal bar projects symmetrically beyond said periphery;
• then
• forming a pair of side shields along said ABS, wherein said side shields are laterally and symmetrically disposed to either side of said pole tip.

A method of forming a magnetic writer, comprising:

• forming a main magnetic pole having a substantially triangular horizontal cross-sectional periphery that is symmetric about a centerline and that tapers towards an ABS at which point it forms a pole tip;
• wherein a horizontal cross-section of said main magnetic pole has a peripheral shape that is a triangle tapering towards said ABS, interrupted a distance d_ABS above said ABS, by two horizontally co-linear projections that extend laterally and symmetrically from each lateral side beyond said triangular periphery;
• wherein each of said projections have an aspect ratio, R, which is the ratio of the horizontal length of said projection, divided by the height of said projection in a direction perpendicular to said ABS;
• forming a pair of side shields along said ABS, wherein said side shields are laterally and symmetrically disposed to either side of said pole tip.