CPP read head for high density and shield noise suppression
US7170720B2 · kind B2 · utility
1Cited by
7References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2003 |
| Grant date | Jan 30, 2007 |
| Priority date | — |
| Expiry date | Mar 20, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/3996
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
It is known that the magnetic shields, between which CPP GMR stacks are sandwiched, can be a source of AMR (anisotropic magneto-resistance) noise. This has been significantly reduced by coating both the magnetic shields with highly conductive layers. If the guidelines disclosed in the invention are followed, the read head can exhibit AMR noise reduced by about 14 to 20. Additionally, the total thickness of the read gap can be maintained to be as low as 300 to 400 Angstroms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.