A micromagnetostrictive vibrator using a U-shaped core made of iron-gallium alloy (Galfenol) was investigated. The vibrator consists of a Galfenol core, with a cross section, a length of , and a separation between the prongs of the “U,” driving coils, and an iron yoke to close the magnetic loop. The Galfenol vibrator is superior to the PZT type in its high mechanical strength, low drive voltage requirements, and wide temperature operating range, and compared to our previous cylindrical type vibrator has a simpler construction and higher bandwidth. A displacement of was verified for the prototype with a long Galfenol core; the high magnetostriction is inherited from the stress-annealed Galfenol. The displacement was also maintained under a tensile stress ( hanging weight). Incorporation of a Nd–B–Fe magnet into the magnetic circuit successfully shifted the operating point to the linear portion of the magnetostrictive curves. This biasing effect is useful in reducing the drive voltage.
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1 April 2008
Proceedings of the 52nd Annual Conference on Magnetism and Magnetic Materials
5-9 November 2007
Tampa, Florida (USA)
Research Article|
Magnetism and Magnetic Materials|
January 25 2008
Micromagnetostrictive vibrator using a U-shaped core of iron-gallium alloy (Galfenol)
T. Ueno;
T. Ueno
a)
University of Tokyo
, 7-3-1 Hongol, Bunkyo-ku, Tokyo 113-8656, Japan
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T. Higuchi;
T. Higuchi
University of Tokyo
, 7-3-1 Hongol, Bunkyo-ku, Tokyo 113-8656, Japan
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C. Saito;
C. Saito
Namiki Precision Jewel Co., Ltd.
, Tokyo 123-8656, Japan
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N. Imaizumi;
N. Imaizumi
Namiki Precision Jewel Co., Ltd.
, Tokyo 123-8656, Japan
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M. Wun-Fogle
M. Wun-Fogle
Naval Surface Warfare Center
, Carderock Division, West Bethesda, Maryland 20817-5700, USA
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a)
Electronic mail: [email protected].
J. Appl. Phys. 103, 07E904 (2008)
Article history
Received:
September 08 2007
Accepted:
September 24 2007
Citation
T. Ueno, T. Higuchi, C. Saito, N. Imaizumi, M. Wun-Fogle; Micromagnetostrictive vibrator using a U-shaped core of iron-gallium alloy (Galfenol). J. Appl. Phys. 1 April 2008; 103 (7): 07E904. https://doi.org/10.1063/1.2828587
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