Patent ID: 7978431
Filing Date: 2011-07-12
Classification: G11B,Y10T

Abstract:
1. A method of fabricating a PMR head having an upper shield and a bottom side shielded pole comprising: providing a substrate; forming a vertically sequential double layer on said substrate, said double layer including a bottom layer of magnetic shield material formed on said substrate and an upper layer of non-magnetic insulating material formed on said lower layer; forming a trench within said double layer, said trench extending in a first horizontal direction for a first distance and said trench having a uniform truncated-wedge shaped cross-section having a maximum width in a second horizontal direction in a plane perpendicular to said first direction and said trench thereby separating said double layer into two separate pieces with slanted, facing, planar sidewalls; forming a side-gap layer that conformally lines exposed surfaces of said trench and extends laterally to conformally cover an upper surface of said upper layer of non-magnetic material; forming a magnetic pole on said substrate, a portion of said pole extending for said first distance within said lined trench and forming, thereby, a pole tip having a uniform cross-sectional shape that is congruent to the cross-sectional shape of said trench; forming a planar upper surface that includes the upper surface of said pole tip and the laterally surrounding upper surface of said side-gap layer; forming a horizontal, planar write gap layer over said planar upper surface; and then forming an upper shield over said write gap layer.