Magnetic recording medium
US10424329B2 · kind B2 · utility
3Cited by
1References
15Claims
0Family size
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Key dates
| Filing date | Jul 13, 2016 |
| Grant date | Sep 24, 2019 |
| Priority date | — |
| Expiry date | Jul 13, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium includes a substrate, a seed layer, an under layer, and a perpendicular recording layer having a granular structure. (Ms·αδ1.5(1−Rs)0.33), Ms, and α satisfy (Ms·α·δ1.5(1−Rs)0.33)≤0.1 [μ·emu·(mm)−1.5], Ms≥450 [emu/cc], and α≥1.2. In the above formulas, Ms indicates a saturated magnetization amount, α indicates the gradient of a M-H loop around a coercive force Hc, δ indicates the thickness of the perpendicular recording layer, and Rs indicates a squareness ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.