Thin film perpendicular magnetic recording head, their fabrication process and magnetic disk drive using it
US7532433B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 2007 |
| Grant date | May 12, 2009 |
| Priority date | — |
| Expiry date | May 22, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/1278
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Thin film perpendicular magnetic head with a narrow main pole capable of a high recording density in excess of 100 gigabits per square inch and generating a high magnetic recording field, while also being modified to suppress remanent magnetic fields occurring immediately after writing operation. A return path is provided for supplying a magnetic flux to the main pole, and an conductive coil for excitation of the main pole and return path. The main pole has a pole width of 200 nanometers or less, and a magnetic multilayer made up of a high saturation flux density layer and low saturation flux density layer. The low saturation flux density layer and the high saturation flux density suppress remanent magnetization and prevent erasing after writing by utilizing a closed magnetic domain structure in the pole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.