Shield structure design to improve the stability of an MR head
US7180712B1 · kind B1 · utility
26Cited by
11References
8Claims
0Family size
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Key dates
| Filing date | Feb 28, 2000 |
| Grant date | Feb 20, 2007 |
| Priority date | — |
| Expiry date | Feb 28, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N50/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for forming a laminated shield to improve the stability and performance of an MR read head and the MR read head formed using that shield. The shield consists of two layers of ferromagnetic material separated by a layer of ruthenium, allowing the ferromagnetic layers to form an antiferromagnetic configuration by means of a quantum mechanical exchange interaction. The antiferromagnetic configuration has a stable domain structure and a magnetization that forms closed loops around the shield edges thereby reducing noise in the readback signal and reducing disturbances to the magnetic state of the sensor element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.