Magnetic head having shield layer(s) with low coefficient of thermal expansion and magnetic storage apparatus having same
US8830635B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 2007 |
| Grant date | Sep 9, 2014 |
| Priority date | — |
| Expiry date | Mar 29, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3967
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Embodiments in accordance with the present invention provide a magnetic head of the CPP structure for perpendicular magnetic recording, that is excellent in read performance, and stable in write/read performances by enhancing the external field durability, and further, suppresses deterioration in read sensor property, due to thermal factors. At least either shield layer of a lower magnetic shield layer, and an upper magnetic shield layer, closer to a perpendicular magnetic write head, is made up so as to have a multi-layered structure comprising low thermal expansion nonmagnetic layers, and magnetic layers. Material having a coefficient of thermal expansion smaller than that of a magnetoresistive film is selected as a material for the low thermal expansion nonmagnetic layers of the shield layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.