Two sensor reader for hard disk drive (HDD)
US8824106B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2013 |
| Grant date | Sep 2, 2014 |
| Priority date | — |
| Expiry date | May 18, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A read head with two read sensors enables reading of a magnetically recorded medium of increased areal densities such as would be provided by two-dimensional magnetic recording. The two sensors, which may be formed in separate depositions, are arranged vertically relative to each other as top and bottom sensors, with a downtrack displacement between them that is less than 900 A and a crosstrack displacement that is less than 600 A. Their separate free layers are connected by four or three conducting leads and require no junctions for their connections. In one embodiment each sensor has separate top and bottom shields and leads. In another embodiment, there is a common shield and lead between the two sensors, but a separate top shield/lead for the top sensor and bottom shield/lead for the bottom sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.