Incoherently-reversing magnetic laminate with exchange coupled ferromagnetic layers
US7425377B2 · kind B2 · utility
18Cited by
20References
16Claims
0Family size
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Key dates
| Filing date | Feb 4, 2005 |
| Grant date | Sep 16, 2008 |
| Priority date | — |
| Expiry date | Jul 28, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24975
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A laminate structure is disclosed comprising multiple ferromagnetic layers achieving incoherent reversal while maintaining good SNR. A high magnetic moment density, low anisotropy field material may form a thin overlayer deposited over a high-anisotropy media layer. The media layer may have a lower magnetic moment density than the overlayer and have decoupled magnetic grains. A coupling layer may be interposed between the overlayer and the media layer to modulate the exchange there between, thereby reducing the pass-through of noise while still promoting incoherent reversal to achieve reduced write energy requirements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.