High performance perpendicular magnetic granular media consisting of multiple exchange control layers
US9129638B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2015 |
| Grant date | Sep 8, 2015 |
| Priority date | — |
| Expiry date | Jan 22, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10515
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A perpendicular magnetic recording media comprises a substrate, a first magnetic oxide layer, a first exchange control layer, a second magnetic oxide layer, a second exchange control layer, and a magnetic cap layer positioned above the substrate, in this order. The first magnetic oxide layer may have an anisotropy energy (Ku) between 6×106 and 8×106 erg/cm3, and a magnetization (Ms) between 600 and 800 emu/cm3. The second magnetic oxide layer may have a Ku between 5×106 and 8×106 erg/cm3, and an Ms between 550 and 750 emu/cm3. The first exchange control layer may have an Ms between 0 and 100 emu/cm3. The second exchange control layer may have an Ms between 0 and 40 emu/cm3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.