Bulk-Wave Generation in a Ferromagnetic Metal by Electromagnetic Acoustic Transduction.

Ogi, Hirotsugu; Minoura, Kiyoshi; Hirao, Masahiko

doi:10.1299/kikaia.62.1955

Cited by 3 publications

(2 citation statements)

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“…As the external field increases, the contributions of the Lorentz force and the magnetization force become considerable. The bias field exerted by a permanent magnet in a low carbon steel is usually less than 0.5 kOe, 18 suggesting that the magnetostriction mechanism governs the bulk-wave generation as a whole, regardless of the field direction. We also find the smaller generation efficiency in the tangential bias field than in the normal bias field.…”

Section: ͑28͒mentioning

confidence: 99%

Field dependence of coupling efficiency between electromagnetic field and ultrasonic bulk waves

Ogi

1997

Journal of Applied Physics

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116

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The coupling mechanism of the electromagnetic acoustic transducer (EMAT) for bulk waves has been studied by examining the magnetic-field dependence of the wave amplitudes. A spiral elongated coil placed on a thin plate of low carbon steel excites and receives the longitudinal and the shear waves propagating in the thickness direction in the presence of the bias magnetic field. The field dependences of the bulk-wave amplitudes are measured using the electromagnetic acoustic resonance both for the normal and tangential bias fields, which showed different features, depending on the bias-field direction and the wave mode. A two-dimensional model is presented for the explanation of the observed results. The present analysis emphasizes the inclined total field in the derivation of the magnetostriction constants, which is revealed to play an essential role for the wave generation. Both the measurement and the model analysis conclude that the magnetostrictive effect dominates the EMAT phenomena for the bulk waves in ferromagnetic metal, regardless of the bias field direction.

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Section: ͑28͒mentioning

confidence: 99%

Field dependence of coupling efficiency between electromagnetic field and ultrasonic bulk waves

Ogi

1997

Journal of Applied Physics

Self Cite

116

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“…This EMAT is used for the measurement of in-plane anisotropy in rolled steel sheets (Chapter 9) and the birefringent acoustoelastic stress measurement (Chapter 10). For more detailed analysis, a two-dimensional FEM computation was performed to map out the body-force distributions in materials (Ogi et al, 1996a). The region shown in Fig.…”

Section: Bulk-wave Ematsmentioning

confidence: 99%