Patent ID: 9620153
Date: 2017-04-11
CPC Classifications: G11B

Claim:
1. A magnetic head for perpendicular magnetic recording, 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 having an end face located in the medium facing surface, the main pole being 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 by means of a perpendicular magnetic recording system; a write shield formed of a magnetic material and having an end face located in the medium facing surface; and a first yoke and a second yoke each formed of a magnetic material and connected to the write shield, the first yoke and the second yoke being located on opposite sides of the main pole in a track width direction, wherein the coil includes a main coil portion for driving the main pole, a first sub-coil portion for driving the first yoke, and a second sub-coil portion for driving the second yoke, the main coil portion surrounds at least part of an entire perimeter of the main pole as viewed from the medium facing surface, the first sub-coil portion surrounds at least part of an entire perimeter of the first yoke as viewed from the medium facing surface, the second sub-coil portion surrounds at least part of an entire perimeter of the second yoke as viewed from the medium facing surface, the main coil portion and the first and second sub-coil portions are configured so that a magnetic field produced in the main pole by the main coil portion and a magnetic field produced in each of the first and second yokes by the first and second sub-coil portions are in directions opposite to each other.