Magnetic recording media with dead magnetic layer
US12183377B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 2023 |
| Grant date | Dec 31, 2024 |
| Priority date | — |
| Expiry date | Aug 4, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/235
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium includes a rigid substrate, an amorphous soft magnetic underlayer (SUL) on the substrate, a dead magnetic layer on the SUL, a seed layer on the dead magnetic layer, and a magnetic recording layer (MRL) on the seed layer. The dead magnetic layer is configured to provide an interdiffusion region between the amorphous SUL and seed layer with a saturation magnetic moment per unit area less than 5×10−5 electromagnetic unit (emu)/cm2, and to produce a recording medium having an increase in tracks per inch (TPI) without significant reduction in bits per inch (BPI), and a net increase in areal density capacity (ADC) relative to a recoding medium that does not have the dead magnetic layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.