Magnetic recording medium and method of manufacturing the same
US9721607B2 · kind B2 · utility
107Cited by
1References
17Claims
0Family size
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Key dates
| Filing date | Jun 29, 2016 |
| Grant date | Aug 1, 2017 |
| Priority date | — |
| Expiry date | Jun 29, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/714
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The magnetic recording medium has a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, and the ferromagnetic hexagonal ferrite powder has a crystallite volume as determined by X-ray diffraction analysis ranges from 1,000 nm3 to 2,400 nm3, and a ratio of the crystallite size Dx(107) obtained from a diffraction peak of a (107) plane to a particle size in a direction of an easy axis of magnetization DTEM as determined by observation with a transmission electron microscope, Dx(107)/DTEM, is greater than or equal to 1.1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.