Patent ID: 8611046
Filing Date: 2013-12-17
Classification: G11B

Abstract:
1. A PMR head comprising: A main pole having a substantially trapezoidal ABS shape that is mirror symmetric about a vertical bisector and characterized by four peripheral edges, including a leading edge, a trailing edge that is parallel to said leading edge and vertically separated from said leading edge by a main pole height, MPh, and two side edges tapering towards each other, wherein said trailing edge is wider than said leading edge; and a graded magnetic side shield, symmetrically formed about said vertical bisector and disposed horizontally about said main pole, wherein said graded magnetic side shield has an opening defined by inner edges that are separated from said two side edges of said main pole and wherein a top portion of said graded magnetic side shield has inner edges that are conformal to said side edges of an upper portion of said main pole and produce a side gap of uniform width thereat and wherein a bottom portion of said graded magnetic side shield has inner edges that are not conformal to said side edges of a lower portion of said main pole and produce a side gap of non-uniform width thereat and wherein said inner edges of said bottom portion of said graded magnetic side shield slant outward to form an angle α with respect to said vertical bisector and extend downward to at least said main pole leading edge; and a trailing shield formed vertically above said main pole, a leading edge of said trailing shield horizontally linking said inner edges of said top portion of said graded side shield and being continuous with said graded magnetic side shield, wherein said leading edge of said trailing shield is uniformly separated from said trailing edge of said main pole.