Magnetic recording write apparatus having a pole including an assist portion extending in the cross-track direction
US9558763B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2016 |
| Grant date | Jan 31, 2017 |
| Priority date | — |
| Expiry date | Mar 25, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3163
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic write apparatus has a media-facing surface (MFS), a pole, side shield(s), a side gap and coil(s) for energizing the pole. The pole includes main and assist portions. The main portion is ferromagnetic, includes a pole tip and includes side surface(s) having a flare angle from the MFS. The pole tip occupies a portion of the MFS. The flare angle is nonzero and acute. The assist portion adjoins the main portion, extends from the main portion in a direction having a component in a cross-track direction, and has a depth of not more than three hundred nanometers. The side shield(s) occupy another portion of the MFS, have a back surface, and are between the assist portion and the MFS. The assist portion is conformal with the back surface of the side shield(s). The side gap is between the main portion of the pole and the side shield(s).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.