Magnetic recording medium using hexagonal ferrite powder
US10043544B2 · kind B2 · utility
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12Claims
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Key dates
| Filing date | Sep 7, 2016 |
| Grant date | Aug 7, 2018 |
| Priority date | — |
| Expiry date | Sep 7, 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 containing ferromagnetic powder and binder on a nonmagnetic support, wherein the ferromagnetic powder is hexagonal ferrite powder containing, based on number of particles, greater than or equal to 80% isotropic particles that satisfy the relation 1: major axis length/minor axis length <1.2, with an average particle size of the hexagonal ferrite powder being less than or equal to 30 nm, and a squareness in a vertical direction of the magnetic layer being greater than or equal to 0.65 but less than or equal to 1.00.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.