Increase of Efficiency of Magnetostriction SH-Wave Electromagnetic Acoustic Transducer by Angled Bias Field: Piezomagnetic Theory and Measurement

概要

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The increase of the coupling efficiency of a magnetostriction shear-horizontal (SH)-wave electromagnetic acoustic transducer (EMAT) has been achieved by applying an angled bias magnetic field. A generalized model involving piezomagnetic theory is presented to explain the physical principle of the EMAT. It indicates a dominant contribution of the piezomagnetic coefficient $e_{6x}^{(MS)}$ and predicts an efficient generation of the SH waves with an angled bias magnetic field. Dependences of the SH-wave amplitude on the magnitude and direction of the bias field were measured, which showed good agreement with those of the coefficient $e_{6x}^{(MS)}$. The most efficient generation was accomplished with a 45° angled bias field. The amplitude gain was 250%.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2003-05-15