Patent ID: 7573683
Filing Date: 2009-08-11
Classification: G11B,Y10T

Abstract:
1. A write head for a disk drive, the write head suitable for perpendicularly recording data in an adjacent magnetic recording medium, the magnetic recording medium comprising a magnetic recording layer on a soft underlayer (SUL), the write head comprising: a pole tip; a write yoke connected to the pole tip; a write return yoke, wherein the write yoke connects to a first end of the write return yoke; a write shield connected to a second end of the write return yoke different from the first end; one or more electrically conductive coils surrounding the write yoke; and one or more side shields disposed in close proximity to the pole tip; wherein each of the one or more side shields is separated from the pole tip by a non-magnetic material or by a magnetic material with low saturation magnetization or by a magnetic material with low permeability; and wherein each of the one or more side shields is separated from the write shield by a particular non-magnetic material or by a particular magnetic material with low saturation magnetization or by a particular magnetic material with low permeability; and wherein the one or more side shields are dimensioned and spaced such that each of the one or more side shields has a magnetic potential higher than the magnetic potential of the write shield but an induced field in the magnetic recording layer from each of the one or more side shields is lower than a nucleation field of the magnetic recording layer during a write operation.