Patent ID: 7126788
Filing Date: 2006-10-24
Classification: G11B

Abstract:
1. A magnetic head for writing information on a relatively-moving medium, the head comprising: a body having a leading end, a trailing end and a medium-facing surface; a first ferromagnetic layer disposed in the body and terminating in a first pole tip disposed adjacent to the medium-facing surface; a second ferromagnetic layer magnetically coupled to the first ferromagnetic layer distal to the medium-facing surface and terminating in a second pole tip that is disposed adjacent to the medium-facing surface, between the first pole tip and the trailing end, and spaced from the first pole tip by a nanoscale nonferromagnetic gap; a third ferromagnetic layer magnetically coupled to the first ferromagnetic layer distal to the medium-facing surface and terminating in a third pole tip disposed adjacent to the medium-facing surface and at least one micron from the first pole tip, the third pole tip having a medium-facing area that is at least two orders of magnitude greater than that of the first pole tip, the third pole tip residing between the first pole tip and the leading end; and an electrically conductive coil section disposed between the second ferromagnetic layer and the third ferromagnetic layer to induce magnetic flux in the first ferromagnetic layer.