Patent ID: 7375925
Filing Date: 2008-05-20
Classification: G11B

Abstract:
1. A magnetic head for perpendicular magnetic recording comprising: a medium facing surface that faces toward a recording medium; a coil for generating a magnetic field corresponding to data to be written on the recording medium; a pole layer having an end face located in the medium facing surface, allowing a magnetic flux corresponding to the field generated by the coil to pass therethrough, and generating a write magnetic field for writing the data on the recording medium through the use of a perpendicular magnetic recording system; an encasing section made of a nonmagnetic material and having an encasing groove that opens in a top surface thereof and that accommodates at least part of the pole layer; and a substrate on which the encasing section, the pole layer and the coil are stacked, wherein: the pole layer incorporates: a first portion having the end face located in the medium facing surface; and a second portion that is located farther from the medium facing surface than the first portion and has a thickness greater than a thickness of the first portion; a surface of the first portion closer to the substrate is located farther from the substrate than a surface of the second portion closer to the substrate; the end face of the pole layer located in the medium facing surface has a side located away from the substrate, this side defining a track width; and the encasing section incorporates: an encasing layer that is made of a nonmagnetic material and defines geometries of a bottom and sidewalls of the encasing groove; and a nonmagnetic metal layer that is made of a nonmagnetic metal material, is disposed on the encasing layer, and defines a plane geometry of the encasing groove.