Preparation and properties of elastically coupled electro-magnetic elements with a bonding structure

Elastically coupled electro-magnetic (EM) elements were constructed and their fundamental properties were studied so as to examine whether the elements exhibit considerable EM effect at room temperature. The elements had a hybrid structure, in which highly magnetostrictive amorphous FeCoSiB films deposited on a thin glass substrate were bonded on PZT piezoelectric substrates. When a dc voltage was applied to the element, large changes in magnetic properties of the FeCoSiB film were observed: for example, by applying dc voltages ranging from ~200 V to +200 V, the change in magnetic permeability of the film reached about 1680%. It was also demonstrated that high frequency impedance of the element was subject to change with a dc voltage. These unique characteristics of the elements are considered to be very attractive for constructing smart actuators with a sensing function