Magnetic read head
US7349186B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 2004 |
| Grant date | Mar 25, 2008 |
| Priority date | — |
| Expiry date | Apr 3, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3906
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A TMR head capable of reconciling high output with high band width is implemented. To that end, two multilayered films each comprised of an insulating layer and a ferromagnetic layer are formed at different locations on an electrode layer, and a current is caused to flow from the ferromagnetic layer of a first multilayered film to the electrode layer while polarized spin is diffused up to a portion of the electrode layer, directly underneath the other multilayered film comprised of the insulating layer and the ferromagnetic layer, thereby detecting a change in resistance, according to a change in the magnetization direction of the ferromagnetic layer of a second multilayered film by use of a circuit extremely large in input impedance, such as a FET.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.