Perpendicular magnetic recording media with laminated soft magnetic underlayer
US6660357B1 · kind B1 · utility
19Cited by
27References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 2, 2001 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | Oct 2, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Magnetic recording media having a biased soft magnetic underlayer are disclosed. The soft magnetic underlayer includes at least two soft magnetic layers separated by a thin non-magnetic layer. Magnetostatic coupling between the soft magnetic layers causes the magnetizations in the layer to be anti-parallel. The biased soft magnetic underlayer is brought into a substantially single-domain state, thereby reducing or eliminating unwanted noise in the soft underlayer. In a preferred embodiment, the recording media includes a perpendicular magnetic recording disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.