Reviews of topical problems

Shape memory ferromagnets

 a, b, c,  d,  e,  f, g,  h
a Department of Theoretical Physics, Institute of Physics, St. Petersburg State University, ul. Ulyanovskaya 1, Petrodvorez, St. Petersburg, 198904, Russian Federation
b Lomonosov Moscow State University, Vorobevy Gory, Moscow, 119991, Russian Federation
c Lomonosov Moscow State University, Faculty of Physics, Leninskie Gory 1 build. 2, Moscow, 119991, Russian Federation
d Chelyabinsk State University, ul. Bratev Kashirinykh 129, Chelyabinsk, 454021, Russian Federation
e Institute of Fluid Science, Tohoku University, Sendai, Japan
f National Institute of Advanced Industrial Science and Technology, Tohoku Center 4-2-1, Nigatake, Miyagino-ku, Sendai, 983-8551, Japan
g Institute of Radio Engineering and Electronics, Russian Academy of Sciences, ul. Mokhovaya 11, Moscow, 125009, Russian Federation
h G.V. Kurdyumov Institite ofMetal Science and Physics, State Research Centre ofthe Russian Federation, I.P. Bardin Central Research Institute ofFerrous 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 Ni2+xMn1-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 Ni2+xMn1-xGa single crystals, a reversible strain of ~6% is obtained in fields of ~1 T.

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Fulltext is also available at DOI: 10.1070/PU2003v046n06ABEH001339
PACS: 62.20.Fe, 75.30.Kz, 75.80.+q, 81.30.Kf (all)
DOI: 10.1070/PU2003v046n06ABEH001339
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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:   ,   ,  ,   ,    «   » 173 577–608 (2003); DOI: 10.3367/UFNr.0173.200306a.0577

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