Thin film magnetic head and method of manufacturing the same
US6952325B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 2002 |
| Grant date | Oct 4, 2005 |
| Priority date | — |
| Expiry date | Jun 26, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3967
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Provided is a thin film magnetic head capable of ensuring the strength of a perpendicular magnetic field and improving recording performance. A bottom pole portion layer and a top pole portion layer constituting a part of a main magnetic pole are formed so that a cross sectional area of a complex including front end portions of the bottom pole portion layer and the top pole portion layer is smaller than a cross sectional area of a complex including rear end portions thereof, and a width of a top edge in an exposed surface is larger than a width of a bottom edge, and is equal to or larger than a width of the exposed surface in a middle position between the top edge and the bottom edge. In recording, magnetic fluxes flowing in a main magnetic pole are focused toward an air bearing surface, and are concentrated on the front end portion of the top pole portion layer which is a main emitting portion of the magnetic fluxes, so sufficient magnetic fluxes can be supplied to the air bearing surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.