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Proceedings Paper

Effect of crystal structure on magnetic-field-induced strain in Ni-Mn-Ga
Author(s): Alexei Sozinov; Alexander Anatolyevich Likhachev; Nataliya Lanska; Outi Soderberg; Kari Ullakko; Veikko K. Lindroos
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Paper Abstract

Magnetic shape memory materials are expected to have a high potential in practical applications. Several ferromagnetic materials exhibiting the large magnetic-field-induced strain have been found in recent years. The largest field-induced strain is observed in Ni-Mn-Ga system. The most important experimental results on crystal structure, magnetic anisotropy and twinning stress of martensitic phases in Ni-Mn-Ga having tetragonal five-layered, orthorhombic seven-layered and tetragonal non-layered crystal structures are reported. Depending on the martensite crystal structure Ni-Mn-Ga alloys are able to show a really giant strain response (approximately 6% in tetragonal five-layered or 10% in orthorhombic seven-layered martensitic phase) in a magnetic field less than 1 T. Contrary to these two phases, a detectable field-induced strain is not observed in non-layered tetragonal martensitic phase in Ni-Mn-Ga system. Effect of crystal structure is in a good agreement with calculation of the magnetic-field-induced strain based on the model developed by authors. The effect of composition on appearance of undesirable non-layered tetragonal martensitic phase in Ni-Mn-Ga system is discussed based on the new experimental results.

Paper Details

Date Published: 13 August 2003
PDF: 9 pages
Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); doi: 10.1117/12.484353
Show Author Affiliations
Alexei Sozinov, Helsinki Univ. of Technology (Finland)
Alexander Anatolyevich Likhachev, Helsinki Univ. of Technology (Finland)
Nataliya Lanska, Helsinki Univ. of Technology (Finland)
Outi Soderberg, Helsinki Univ. of Technology (Finland)
Kari Ullakko, Helsinki Univ. of Technology (Finland)
Veikko K. Lindroos, Helsinki Univ. of Technology (Finland)

Published in SPIE Proceedings Vol. 5053:
Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics
Dimitris C. Lagoudas, Editor(s)

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