Abstract
Magnetostrictive Ni0.837Cu0.148Co0.015Fe2.000O4 ferrite films 10–60 μ thick were prepared on alumina and sapphire plates by vacuum-arc evaporation and by cathodic sputtering. The films of 30-μ thickness deposited on a sapphire rod, generated and detected 50-MHz shear waves by operation in conjunction with a quartz transducer. A commercial cubic magnet, of subcentimeter size, applied a bias field sufficient to operate the films. On the other hand, the films of 40-μ thickness sputtered on an alumina plate with eight-turn meander line on their surfaces generated and detected 10.8-MHz (wavelength 400 μ) surface elastic waves. It was unnecessary to apply any external bias field to operate the films, due to the use of a large internal stress induced in them during the heat treatment. Consequently, the deposited and the sputtered ferrite films can be applied to the shear and surface elastic wave transducers, respectively.
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