Patent ID: 7843665

Claim:
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 allowing a magnetic flux corresponding to the magnetic field generated by the coil to pass therethrough, and generating a write magnetic field for writing the data on the recording medium by means of a perpendicular magnetic recording system; a main shield layer made of a magnetic material, having an end face disposed in the medium facing surface, and having a portion that is away from the medium facing surface and coupled to the pole layer; a gap layer made of a nonmagnetic material, the gap layer provided between the pole layer and the main shield layer, and having an end face disposed in the medium facing surface; an encasing layer made of a nonmagnetic material and having a groove that opens in a top surface thereof, the pole layer having an end face located in the medium facing surface and a top face that is perpendicular to the end face of the pole layer and opposite the encasing layer; a nonmagnetic metal layer made of a nonmagnetic metal material, the nonmagnetic metal layer having a sidewall located directly above an edge of the groove, an upper surface that is perpendicular to the sidewall and a lower surface, the lower surface of the nonmagnetic metal layer being opposite the upper surface of the nonmagnetic metal layer and disposed on the top surface of the encasing layer, the upper surface of the nonmagnetic metal layer being even with the top face of the pole layer, the nonmagnetic metal layer being disposed on a region of the top surface of the encasing layer away from the medium facing surface; two side shield layers made of a magnetic metal material that have sidewalls located directly above the edge of the groove and that are disposed adjacent to the nonmagnetic metal layer on regions of the top surface of the encasing layer closer to the medium facing surface than the nonmagnetic metal layer, the two side shield layers having two end faces located in the medium facing surface on both sides of the end face of the pole layer, the both sides being opposed to each other in a direction of track width; an encasing section that is formed of the groove, the sidewall of the nonmagnetic metal layer, and the sidewalls of the side shield layers and that accommodates at least part of the pole layer; and a nonmagnetic film made of a nonmagnetic material and disposed between the pole layer and the sidewalls of the side shield layers.