Patent ID: 9489969
Filing Date: 2016-11-08
CPC Classification: G11B

Claim Text:
1. A magnetic head comprising: a medium facing surface configured to face a recording medium; a coil for producing a magnetic field corresponding to data to be written on the recording medium; a main pole configured to pass a magnetic flux corresponding to the magnetic field produced by the coil, and to produce a write magnetic field for use to write the data on the recording medium; a write shield formed of a magnetic material; and a gap section provided between the main pole and the write shield, and including a first nonmagnetic layer and a second nonmagnetic layer each formed of a nonmagnetic material, wherein the main pole has: an end face located in the medium facing surface; a top surface located at a front-side end of the main pole in a direction of travel of the recording medium; a bottom end opposite to the top surface; and a first side surface and a second side surface located at opposite ends of the main pole in a track width direction, the write shield includes: a leading shield located on a rear side in the direction of travel of the recording medium relative to the main pole; and a trailing shield located on a front side in the direction of travel of the recording medium relative to the main pole, the leading shield has a leading shield end face located in the medium facing surface and a top surface opposed to the bottom end of the main pole, the leading shield end face being located on the rear side in the direction of travel of the recording medium relative to the end face of the main pole, the trailing shield has a trailing shield end face located in the medium facing surface and a bottom surface opposed to the top surface of the main pole, the trailing shield end face being located on the front side in the direction of travel of the recording medium relative to the end face of the main pole, the gap section includes: a leading gap section for separating the leading shield from the bottom end of the main pole; and a trailing gap section for separating the trailing shield from the top surface of the main pole, the leading gap section is formed using the first nonmagnetic layer and the second nonmagnetic layer, the first nonmagnetic layer has a first front end located closest to but at a distance from the medium facing surface, the second nonmagnetic layer has a second front end located in the medium facing surface, the top surface of the leading shield includes a first portion and a second portion, the first portion has an end located in the medium facing surface, the second portion is located farther from the medium facing surface than is the first portion, and recessed from the first portion, the first nonmagnetic layer is interposed between the second portion and the second nonmagnetic layer, the bottom end of the main pole includes a third portion opposed to the first portion, and a fourth portion opposed to the second portion, the second nonmagnetic layer is interposed between the first portion and the third portion, whereas the first nonmagnetic layer is not interposed therebetween, the first and second nonmagnetic layers are interposed between the second portion and the fourth portion, and the second portion and the fourth portion are substantially parallel to each other.