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This paper proposes a novel electromagnetic acoustic transducer (EMAT) integrating a magnetostrictive Fe₃O₄ coating and a flexible coil, to address limitations of traditional EMATs such as coupling agent reliance and narrow application scope of rigid strips. Fe3O₄ is selected for its prominent magnetostrictive performance, oxidation resistance and high Curie temperature. The EMAT uses a permanent magnet to pre-magnetize the Fe₃O₄ coating, which serves as both bias source and pre-magnetization medium. A flexible spiral coil (0.12 mm in diameter) generates high-frequency alternating magnetic fields. Ultrasonic waves are induced in the Fe₃O₄ coating via magnetostriction, driven by the interaction between dynamic and bias magnetic fields. The coil detects magnetic field variations from coating vibrations for signal reception. Experiments confirm the EMAT’s feasibility: its shear wave and longitudinal wave signal-to-noise ratios reach 24.8 and 17.6 dB, respectively. Lightweight and compact, this EMAT suits long-term structural monitoring of complex components in harsh environments.

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Development of a Novel Electromagnetic Acoustic Transducer with Magnetostrictive Fe3O4 Coating and Flexible Coil

  • 会议论文

  • 发表日期：

    2026年

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  • Caixia Peng,
  • Kexin Cheng,
  • Haoyu Wang,
  • Rui Yuan,
  • Zhichao Li,
  • Bao Liang

摘要

This paper proposes a novel electromagnetic acoustic transducer (EMAT) integrating a magnetostrictive Fe₃O₄ coating and a flexible coil, to address limitations of traditional EMATs such as coupling agent reliance and narrow application scope of rigid strips. Fe3O₄ is selected for its prominent magnetostrictive performance, oxidation resistance and high Curie temperature. The EMAT uses a permanent magnet to pre-magnetize the Fe₃O₄ coating, which serves as both bias source and pre-magnetization medium. A flexible spiral coil (0.12 mm in diameter) generates high-frequency alternating magnetic fields. Ultrasonic waves are induced in the Fe₃O₄ coating via magnetostriction, driven by the interaction between dynamic and bias magnetic fields. The coil detects magnetic field variations from coating vibrations for signal reception. Experiments confirm the EMAT’s feasibility: its shear wave and longitudinal wave signal-to-noise ratios reach 24.8 and 17.6 dB, respectively. Lightweight and compact, this EMAT suits long-term structural monitoring of complex components in harsh environments.