Current-perpendicular-to-the-plane (CPP) magnetoresistive (MR) sensor with magnetic damping material at the sensor edges
US8576519B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2012 |
| Grant date | Nov 5, 2013 |
| Priority date | — |
| Expiry date | Oct 11, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F10/3272
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A current-perpendicular-to-the-plane magnetoresistive sensor has magnetic damping material located adjacent either or both of the sensor side edges and back edge to reduce the effect of spin transfer torque. The damping material may be Pt, Pd, Os, or a rare earth metal from the 15 lanthanoid elements. The damping material may be an ultrathin layer in contact with the sensor edges. An insulating layer is deposited on the damping layer and isolates the sensor's ferromagnetic biasing layer from the damping layer. Instead of being a separate layer, the damping material may be formed adjacent the sensor edges by being incorporated into the material of the insulating layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.