Magnetic recording medium, magnetic storage and method for reproducing information from magnetic recording medium
US7502188B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2004 |
| Grant date | Mar 10, 2009 |
| Priority date | — |
| Expiry date | Aug 30, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/676
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium includes a first magnetic layer; and a second magnetic layer formed on the first magnetic layer. The first magnetic layer and the second magnetic layer make exchange coupling therebetween and also, have their magnetizing direction in anti-parallel to one another. A net residual area magnetization of the first magnetic layer and the second magnetic layer is expressed by the following formula: |Mr1×t1−Mr2×t2| where Mr1 and Mr2 denote respective residual magnetizations of the first magnetic layer and the second magnetic layer, and t1 and t2 denote respective film thicknesses of them; and the net area magnetization at a first temperature is larger than the net area magnetization at a second temperature lower than the first temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.