Abstract
The variable surface acoustic wave (SAW) delay line was constructed in such a way that the amorphous TbFe2 film was deposited by co-sputtering on the wave- propagating surface of the LiNbO3 substrate. When the thickness of the magnetic film was about 2.5 µm, the SAW velocity in the range of frequency of 42 MHz could be continuously varied up to 0.27% by applying the magnetic field of a few kilo-oersted. The result of the calculation based upon a simple model suggested that the variation in the SAW velocity was mainly attributed to the electromechanical coupling factor k15 which dominated the interaction between magnetic moments and SAWs in the magnetic material.
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