Perpendicular magnetic recording media with thin soft magnetic underlayers and recording systems comprising same
US8465854B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 2006 |
| Grant date | Jun 18, 2013 |
| Priority date | — |
| Expiry date | Jun 9, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/7373
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A perpendicular magnetic recording medium comprises a non-magnetic substrate having a surface; and a plurality of overlying thin film layers forming a layer stack on the substrate surface, the layer stack including a magnetically hard perpendicular magnetic recording layer structure and an underlying soft magnetic underlayer (SUL), the SUL having a thickness of up to about 100 Å. Also disclosed is a data/information recording, storage, and retrieval system comprising the perpendicular magnetic recording medium and a single-pole magnetic transducer head including main and auxiliary poles positioned in spaced adjacency to an upper surface of the layer stack, the single-pole transducer head comprising a front shield adjacent the main pole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.