Patent ID: 8717708
Filing Date: 2014-05-06
Classification: G11B,Y10T

Abstract:
1. A magnetic head for perpendicular magnetic recording, flying above a rotating magnetic disk and carrying out data writing and reading, the magnetic head comprising: a head element including a main pole mounted on a yoke and having a pole face on a flying surface facing said magnetic disk and an auxiliary pole configured for return of a magnetic field emitted from said main pole; alignment marks made of a magnetic material in a same layer as said yoke and used to detect an amount of lapping work when lapping the pole face of said main pole; and members made of a magnetic material, continuously extending in either direction with respect to a position of said main pole from within said alignment marks outward at least beyond the alignment marks to alleviate magnetic flux concentration on said alignment marks; wherein a first portion of said members is flush with the flying surface of the magnetic head, wherein a second portion of said members is gradually tapered away from the flying surface; wherein the alignment marks are in proximity to only the second portion of said members.