Multi-directional field annealing of a thin-film electromagnetic read/write head
US4544421A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 11, 1983 |
| Grant date | Oct 1, 1985 |
| Priority date | — |
| Expiry date | Oct 11, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F41/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of field annealing a thin-film electromagnetic read/write head formed of magnetic-field-responsive material having a known Curie temperature. Such a head also includes an electric coil for operatively exciting the head. The method includes the steps of heating the head to a temperature less than the Curie temperature, and then cooling the head while applying electric current to the coil sufficient to induce magnetic flux in the head. The foregoing steps, properly applied, align the magnetic-field-responsive structure, such as magnetic domains in a soft magnetic material, in the direction of operative flux flow in the head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.