Soft magnetic thin film, method for preparing same and magnetic head
US6238492A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1997 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Oct 24, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F10/265
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A soft magnetic thin micro-crystalline film of Fe.sub.a T.sub.b N.sub.c (at %) wherein T is at least one of Zr, Hf, Ti, Nb, Ta, V, Mo, and W and 0<b.ltoreq.20, and 0<c.ltoreq.22 except the range of b.ltoreq.7.5 and c.ltoreq.5, shows low coercivity Hc of 80-400 Am.sup.-1 (1-5 Oe) which is stable upon heating at elevated temperatures for glass bonding. This film is produced by crystallizing an amorphous alloy film of the similar composition at 350-650.degree. C. to a crystal grain size up to 30 nm to provide uniaxial anisotropy and increased magnetic permeability at a higher frequency. It can also provide low magnetostriction around .lambda.s=0. A composite magnetic head is made using this thin film. A diffusion preventive SiO.sub.2 layer is disposed between ferrite cores, and this thin film in the magnetic head prevents an interdiffusion layer and suppresses beat in the output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.