Perpendicular magnetic recording medium
US9940961B2 · kind B2 · utility
2Cited by
0References
4Claims
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Key dates
| Filing date | Apr 6, 2015 |
| Grant date | Apr 10, 2018 |
| Priority date | — |
| Expiry date | Dec 31, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/672
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A perpendicular magnetic recording medium includes a non-magnetic substrate; and a magnetic recording layer that includes magnetic crystal grains and a non-magnetic crystal grain boundary that surrounds the magnetic crystal grains, wherein the magnetic crystal grains contain an ordered alloy and the non-magnetic crystal grain boundary contains Ge oxides. The magnetic recording layer may have a granular structure. The magnetic crystal grains may be micronized to be sufficiently ordered and separated, and the perpendicular magnetic recording medium may have a high magnetic anisotropy constant Ku and high coercivity Hc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.