Magnetically tunable surface acoustic wave devices

Details Magnetically tunable surface acoustic wave devices Magnetically tunable surface acoustic wave devices

1997-10-27

1999-09-28

Ramirez, Nestor

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

333201, 310313A, H01L 4104, H03H 734

Patent

active

059593881

ABSTRACT:
In accordance with the invention, the operating frequency of a SAW device is magnetically tuned. In a first embodiment, the SAW device comprises a piezoelectric layer mechanically coupled to a substrate or body of magnetostrictive material. Strains magnetically induced in the magnetostrictive substrate is coupled to the piezoelectric layer, altering the velocity at which it can transmit acoustic waves. In an alternative embodiment, surface waves are directly generated in a magnetostrictive material and the velocity is directly altered by an applied magnetic field.

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patent: 5343175 (1994-08-01), Davenport
patent: 5576589 (1996-11-01), Dreifus et al.

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