Self-biased magnetostrictive element for magnetomechanical electronic article surveillance systems
US5565849A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1995 |
| Grant date | Oct 15, 1996 |
| Priority date | — |
| Expiry date | Feb 22, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N35/85
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A self-biasing magnetostrictive element for a magnetomechanical EAS marker is formed by first annealing a ribbon of ferromagnetic material in the presence of a magnetic field applied in a transverse direction relative to the ribbon's longitudinal axis, and then annealing the ribbon a second time in the presence of a magnetic field applied in the direction of the longitudinal axis. The twice-annealed ribbon exhibits remanent magnetization along the longitudinal axis and has plural magnetic domains situated along the longitudinal axis. The orientation of magnetization in each domain is canted by .+-..theta..degree.<90.degree. from the ribbon axis with the direction of canting alternating from domain to domain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.