Tunnel MR head with closed-edge laminated free layer
US7630177B2 · kind B2 · utility
9Cited by
12References
10Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 14, 2006 |
| Grant date | Dec 8, 2009 |
| Priority date | — |
| Expiry date | Apr 19, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/399
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a tunnel magnetoresistive (TMR) device, free sublayers are separated by an intermediate spacer layer that serves to ensure a uniform circumferential magnetization in the free stack, counterbalancing orange-peel coupling by antiferromagnetic exchange coupling. Thus, a CPP MR device may have a seed stack, a pinned stack on the seed stack, and a tunnel barrier on the pinned stack. A free stack can be on the tunnel barrier, and the free stack can include structure for promoting uniform circumferential magnetization in the free stack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.