Magnetically tunable ultrasonic transducers for shear waves
Single crystal platelets of FeBO3 are used as magnetoelastically excited shear wave transducers in the 10–100MHz region. Due to a strong dependence of the elastic stiffness on an applied magnetic dc field the resonance frequency is magnetically tunable in a region of about 25 percent around the centre frequency. A pulse-echo experiment was used to compare the conversion efficiencies of the FeBO3 transducer and a conventional quartz transducer. The insertion losses were found to be approximately equal for both transducers and in accordance with the calculated values.
PACS75.80.+q 62.20. Dc
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