Perpendicular magnetic recording head utilizing a nonmagnetic underlayer layer
US7911735B1 · kind B1 · utility
158Cited by
3References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 9, 2007 |
| Grant date | Mar 22, 2011 |
| Priority date | — |
| Expiry date | Oct 16, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49041
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The method and system for providing a perpendicular magnetic recording (PMR) head are described. The PMR head includes a base layer, a nonmagnetic metal underlayer on the base layer, and a PMR pole on the nonmagnetic metal underlayer. The PMR pole has a top that is wider than its bottom. The base layer has a first hardness with respect to a pole trim. The nonmagnetic metal underlayer has a second hardness with respect to the pole trim. The second hardness is less than the first hardness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.