Three types of magnetic-field-operated shape memory effects

Yoshitake Nishi; Hiromasa Yabe; Naotada Hagiwara; Kazuya Oguri; Takashi Asaka; Haru-Hisa Uchida; Yoshihito Matsumura; Hirohisa Uchida

doi:10.1117/12.424391

6 April 2001 Three types of magnetic-field-operated shape memory effects

Yoshitake Nishi, Hiromasa Yabe, Naotada Hagiwara, Kazuya Oguri, Takashi Asaka, Haru-Hisa Uchida, Yoshihito Matsumura, Hirohisa Uchida

Author Affiliations +

Proceedings Volume 4234, Smart Materials; (2001) https://doi.org/10.1117/12.424391
Event: Smart Materials and MEMS, 2000, Melbourne, Australia

Abstract

Three types of magnetic field operated shape memory ceramics have been developed. Namely, the shape memory movements can be operated by changes in magnetic flux density. The reversible shape memory effects are often induced by magnetostriction and magnetic field induced twin formation for Fe-Pd alloys. The former shows the precise shape change, whereas the later shows the large shape change expected. The strain value was about 182 ppm at 0.3 kOe at room temperature. The high magnetostrictive susceptibility was detected at low magnetic field. It was higher than that of Tb_0.3Dy_0.7Fe₂ thin film developed. The other magnetic field operated shape change is recently found on softening near critical temperature of superconductors. The softening induced shape memory effect (SSME) has been found from 9.5 K to 20 K in pure metallic niobium.

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Yoshitake Nishi, Hiromasa Yabe, Naotada Hagiwara, Kazuya Oguri, Takashi Asaka, Haru-Hisa Uchida, Yoshihito Matsumura, and Hirohisa Uchida "Three types of magnetic-field-operated shape memory effects", Proc. SPIE 4234, Smart Materials, (6 April 2001); https://doi.org/10.1117/12.424391

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