Magnetic recording medium having at least two coupled magnetic layers, magnetic storage apparatus and recording method
US7271984B2 · kind B2 · utility
11Cited by
9References
19Claims
0Family size
Assignee
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Key dates
| Filing date | May 21, 2004 |
| Grant date | Sep 18, 2007 |
| Priority date | — |
| Expiry date | Oct 12, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium is provided with a first magnetic layer, a nonmagnetic coupling layer provided on the first magnetic layer, and a second magnetic layer provided on the nonmagnetic coupling layer. The first and second magnetic layers are exchange-coupled, and have magnetization directions which are mutually parallel in a state where no external magnetic field is applied thereto, and the first magnetic layer switches the magnetization direction thereof before the second magnetic layer in response to a recording magnetic field which switches the magnetization directions of the first and second magnetic layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.