Self-biased magnetostrictive element for magnetomechanical elect

Details Self-biased magnetostrictive element for magnetomechanical elect Self-biased magnetostrictive element for magnetomechanical elect

1995-02-22

1996-10-15

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

148108, G08B 1314

Patent

active

055658490

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.

REFERENCES:
patent: 4158434 (1979-06-01), Peterson
patent: 4473415 (1984-09-01), Ochiai et al.
patent: 4510489 (1985-04-01), Anderson, III et al.

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