Bistable magnetostrictive device

Details Bistable magnetostrictive device Bistable magnetostrictive device

1977-12-19

1980-11-25

Moffitt, James W.

Static information storage and retrieval

Systems using particular element

Magnetostrictive or piezoelectric

365133, 365136, 148108, 148120, 148 21, 427 47, 427132, G11C 1112

Patent

active

042362300

ABSTRACT:
A device includes a core, such as a wire or cylinder of a solid material such as nonmagnetic metal, coated with a film of a material having a high degree of magnetostriction and a uniaxial helical magnetic anisotropy at an oblique angle to the longitudinal axis of the core. The device has the characteristic of being magnetically bistable and of providing a large magnetic pulse as it changes to one of its stable states in response to passage of a magnetic field by it. To achieve a helical magnetic anisotropy, the magnetostrictive film can be applied to a nonmagnetic wire by plating the wire while it is under torsion, twisting a plated wire after plating, or by applying an electric current and a magnetic field to the wire as the film is being plated or annealed.

REFERENCES:
patent: 3270326 (1966-08-01), Schwartz et al.
patent: 3320596 (1967-05-01), Smith, Jr. et al.
patent: 3820090 (1974-06-01), Wiegand
patent: 4065757 (1977-12-01), Kardashian

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