Magnetic recording medium having cubic ferrite or e-phase iron oxide magnetic particles
US10204651B2 · kind B2 · utility
2Cited by
8References
9Claims
0Family size
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Key dates
| Filing date | Apr 10, 2015 |
| Grant date | Feb 12, 2019 |
| Priority date | — |
| Expiry date | Aug 1, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The magnetic recording medium includes a support and a magnetic layer containing a magnetic powder. The magnetic powder includes at least either of a magnetic particle containing a cubic ferrite and a magnetic particle containing an ε-phase iron oxide. The magnetic powder has a mean particle size of 10 nm or more and 14 nm or less, the magnetic powder has a mean aspect ratio of 0.75 or more and 1.25 or less, and the magnetic layer has a ten-point mean roughness Rz of 35 nm or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.