Shape memory ferromagnets

A.N. Vasil’ev^a, b, c, V.D. Buchel’nikov^d, T. Takagi^e, V.V. Khovailo^f, g, E.I. Estrin^h
^aDepartment of Theoretical Physics, Institute of Physics, St. Petersburg State University, ul. Ulyanovskaya 1, Petrodvorez, St. Petersburg, 198904, Russian Federation
^bLomonosov Moscow State University, Vorobevy Gory, Moscow, 119991, Russian Federation
^cLomonosov Moscow State University, Faculty of Physics, Leninskie Gory 1 build. 2, Moscow, 119991, Russian Federation
^dChelyabinsk State University, ul. Bratev Kashirinykh 129, Chelyabinsk, 454021, Russian Federation
^eInstitute of Fluid Science, Tohoku University, Sendai, Japan
^fNational Institute of Advanced Industrial Science and Technology, Tohoku Center 4-2-1, Nigatake, Miyagino-ku, Sendai, 983-8551, Japan
^gInstitute of Radio Engineering and Electronics, Russian Academy of Sciences, ul. Mokhovaya 11, Moscow, 125009, Russian Federation
^hG.V. Kurdyumov Institite of Metal Science and Physics, State Research Centre of the Russian Federation, I.P. Bardin Central Research Institute of Ferrous Metallurgy, 2-ya Baumanskaya ul. 9/23, Moscow, 105005, Russian Federation

In ferromagnetic alloys with shape memory large reversible strains can be obtained by rearranging the martensitic domain structure by a magnetic field. Magnetization through displacement of domain walls is possible in the presence of high magnetocrystalline anisotropy, when martensitic structure rearrangement is energetically favorable compared to the reorientation of magnetic moments. In ferromagnetic Heusler alloys Ni_2+xMn_1-xGa the Curie temperature exceeds the martensitic transformation temperature. The fact that these two temperatures are close to room temperature offers the possibility of magnetically controlling the shape and size of ferromagnets in the martensitic state. In Ni_2+xMn_1-xGa single crystals, a reversible strain of ~6% is obtained in fields of ~1 T.

PACS: 62.20.Fe, 75.30.Kz, 75.80.+q, 81.30.Kf (all)
DOI: 10.1070/PU2003v046n06ABEH001339
URL: https://ufn.ru/en/articles/2003/6/a/
Web of Science

000185710500001
Citation: Vasil’ev A N, Buchel’nikov V D, Takagi T, Khovailo V V, Estrin E I "Shape memory ferromagnets" Phys. Usp. 46 559–588 (2003)

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Оригинал: Васильев А Н, Бучельников В Д, Такаги Т, Ховайло В В, Эстрин Э И «Ферромагнетики с памятью формы» УФН 173 577–608 (2003); DOI: 10.3367/UFNr.0173.200306a.0577

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