Recording media comprising vertical magnetization layers essentially consisting of quaternary Co--Ni--Zn--P alloys
US4517257A · kind A · utility
5Cited by
3References
4Claims
0Family size
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Key dates
| Filing date | Sep 13, 1983 |
| Grant date | May 14, 1985 |
| Priority date | — |
| Expiry date | Sep 13, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Magnetic recording media suitable for use in vertical magnetization recording systems are described. The media comprise a magnetic layer on at least one side of a substrate. The magnetic layer is made of a specific type of quaternary alloy. The alloy essentially consists of from 3 to 42 wt % of Co, from 54 to 89 wt % of Ni, from 4 to 8 wt % of P, and from 0.1 to 3.2 wt % of Zn provided that (7.2 X.sub.P +12.8) wt %.ltoreq.X.sub.Ni .ltoreq.(7.2 X.sub.P +43.2) wt % in which X.sub.P represents a content of P and X.sub.Ni represents a content of Ni, both expressed by wt %.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.