Increase of efficiency of magnetostriction SH-Wave electromagnetic acoustic transducer by angled bias field : Piezomagnetic theory and measurement

Ogi, Hirotsugu; Goda, Eiji; Hirao, Masahiko

Japanese Journal of Applied Physics, 2003, 42, 3020-3024

Number of Access:587（2025-11-25 02:18 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/84155

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Title
Increase of efficiency of magnetostriction SH-Wave electromagnetic acoustic transducer by angled bias field : Piezomagnetic theory and measurement
Creator
NRID
1000090252626 1000090252626
researchmap permalink
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Scopus Author ID
35563683500 35563683500
ORCID
0000-0002-9602-5194 0000-0002-9602-5194
CreatorName
Ogi, Hirotsugu
CreatorName
Goda, Eiji
NRID
1000080112027 1000080112027
CreatorName
Hirao, Masahiko
Subject
Electromagnetic acoustic transducer
Magnetostriction
Piezomagnetic effect
Surface shear wave
Coupling efficiency
Angled bias field
Description
Hirotsugu Ogi, Eiji Goda and Masahiko Hirao. Increase of efficiency of magnetostriction SH-Wave electromagnetic acoustic transducer by angled bias field : Piezomagnetic theory and measurement. Japanese Journal of Applied Physics, 2003, 42(5S), 3020. https://doi.org/10.1143/jjap.42.3020.
Abstract
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 e6x(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 e6x(MS). The most efficient generation was accomplished with a 45° angled bias field. The amplitude gain was 250%.
Publisher
The Japan Society of Applied Physics
Source Title
Japanese Journal of Applied Physics
Volume (Issue)
42
Page
3020-3024
Date of Issued
2003-05-01
Language
English
Handle URL
https://hdl.handle.net/11094/84155
PISSN
00214922
eISSN
13474065
NCID
AA10457675
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1143/jjap.42.3020
Access Rights
open access
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article