Thin-film laminated magnetic heads of Fe-Si-Al alloy
US4894742A · kind A · utility
16Cited by
6References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1986 |
| Grant date | Jan 16, 1990 |
| Priority date | — |
| Expiry date | Oct 3, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49055
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A magnetic film of Fe-Si-Al alloy comprises a substrate and an Fe-Si-Al alloy film in which argon is entrapped. A thin-film laminated magnetic head comprises a pair of opposed substrates, and alternately laminated Fe-Si-Al alloy films entrapping argon therein and non-magnetic insulating films between the substrates. In the magnetic film and the head the substrates have a thermal expansion coefficient lower than that of the Fe-Si-Al alloy films and the amount of argon entrapped in the alloy films is controlled within the range of about 0.01 to about 0.3 wt. % so that internal stresses in the alloy films are substantially zeroed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.