Magnetic reading head with first and second element units each including a ferromagnetic layer and each with a different spin-polarization
US7969692B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 2007 |
| Grant date | Jun 28, 2011 |
| Priority date | — |
| Expiry date | Jan 23, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F10/3204
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic head includes a pair of ferromagnetic electrodes, namely, a first ferromagnetic electrode layer which is in contact with a portion of a first electrode layer with a first insulating barrier layer interposed in between; and a second ferromagnetic electrode layer which is in contact with another portion of the first electrode layer with a second insulating barrier layer interposed in between. The first electrode layer and the first ferromagnetic layer collectively constitute part of a current-supplying circuit. Moreover, the first electrode layer and the second ferromagnetic layer which are in contact with the first electrode layer with the second insulating barrier layer interposed in between in a region where the two layers are not in contact with the first insulating barrier layer, collectively constitute part of a voltage-measurement circuit. Spin-polarization at the interface in an intersecting region of the second ferromagnetic layer and the second insulating barrier layer, is greater than spin-polarization at the interface in an intersecting region of the first ferromagnetic layer and the first insulating barrier layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.