Thin film perpendicular magnetic recording head, their fabrication process and magnetic disk drive using it
US7221538B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2003 |
| Grant date | May 22, 2007 |
| Priority date | — |
| Expiry date | Feb 22, 2025 |
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 exceeding 10 kOe while suppressing remanent magnetic fields occurring immediately after write operations. The perpendicular magnetic head comprises a main pole, a return path for supplying a magnetic flux to that main pole, and a 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 has a thickness within 0.5 to 5 nanometers, and The high saturation flux density layer has a thickness from 10 to 50.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.