Three terminal magnetic sensing device having a track width defined in a localized region by a patterned insulator and methods of making the same
US8045298B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2007 |
| Grant date | Oct 25, 2011 |
| Priority date | — |
| Expiry date | Aug 23, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/39
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A three terminal magnetic sensing device (TTM) having a trackwidth defined in a localized region by a patterned insulator, and methods of making the same, are disclosed. In one illustrative example, one or more first sensor layers (e.g. which includes a “base” layer) are formed over a collector substrate. A patterned insulator which defines a central opening exposing a top layer of the one or more first sensor layers is then formed. The central opening has a width for defining a trackwidth (TW) of the TTM. Next, one or more second sensor layers are formed over the top layer of the one or more first sensor layers through the central opening of the patterned insulator. The one or more second sensor layers may include a tunnel barrier layer formed in contact with the top layer of the one or more first sensor layers, as well as an “emitter” layer. Various embodiments and techniques are provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.