Thin-film magnetic head
US4855854A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1988 |
| Grant date | Aug 8, 1989 |
| Priority date | — |
| Expiry date | Sep 22, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49064
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A thin-film, perpendicular magnetic head includes a magnetic recording and reproducing substrate having a mechanochemically polished principal surface that includes a plurality of grooves filled with a nonmagnetic material; a thin-film conducting coil located on the polished surface of the substrate; an insulating layer of inorganic oxide covering the conductor coil and the polished principle surface of the magnetic substrate, this insulating layer including a via hole formed therein and having an exposed surface which is mechanochemically polished; a thin-film main pole on the polished surface of the insulating layer; and a protective overcoat covering the main pole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.