Thin-film magnetic head with a spiral recording coil having a first part with a denser pitch closer to the medium facing surface than a second coil part and all set between a pair of magnetic layers
US7764465B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2007 |
| Grant date | Jul 27, 2010 |
| Priority date | — |
| Expiry date | Feb 14, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3136
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A thin-film magnetic head is capable of securing an insulating property and minimizing the projection of a recording element section due to heat expansion. The thin-film magnetic head includes a pair of magnetic layers disposed with a predetermined gap therebetween on a surface facing a recording medium. The layers are connected to each other along an inner part in a height direction from the medium-facing surface. A spiral recording coil is disposed between the pair of magnetic layers and wound around a connecting portion of the pair of magnetic layers. The recording coil includes a dense coil portion formed with a pitch smaller than that of the inner part in the height direction so as to be closer to the medium-facing surface than the connecting portion. An organic insulating layer is locally formed to fill coil gaps of the dense coil portion, and coil gaps other than those of the dense coil portion are filled with an inorganic insulating layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.