Magnetic recording medium, recording and reproducing head, and magnetic recording and reproducing method
US6455174B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1999 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Nov 3, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12611
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium comprises, on a substrate, a recording auxiliary layer, a recording holding layer, recording control layer, and a recording layer. The recording layer is constructed by using a ferri-magnetic material having perpendicular magnetization. The data can be recorded at a super high density by using the recording and reproducing head of the present invention, because the recording layer has the perpendicular magnetization. The disappearance of data, which would be otherwise caused by the thermomagnetic relaxation phenomenon, is suppressed after recording the data, because the recording layer has large coercive force at the room temperature. The data, which is recorded at the super high density on the magnetic recording medium, can be reproduced by using a magnetic resistance element carried on the recording and reproducing head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.