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Magnetoelastic coupling in Ni-Mn-Ga magnetic shape memory alloy
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SYSNO ASEP 0341803 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Magnetoelastic coupling in Ni-Mn-Ga magnetic shape memory alloy Author(s) Heczko, Oleg (FZU-D) RID, ORCID Source Title Materials Science Forum - ISSN 0255-5476
Roč. 635, č. 12 (2010), s. 125-130Number of pages 6 s. Language eng - English Country CH - Switzerland Keywords magnetically induced reorientation (MIR) ; magnetic shape memory effect ; ordinary magnetostriction ; magnetoelastic coupling ; Ni-Mn-Ga Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects IAA200100627 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z10100520 - FZU-D (2005-2011) DOI 10.4028/www.scientific.net/MSF.635.125 Annotation The role of magnetoelastic coupling in the mechanism of magnetically induced reorientation or redistribution (MIR) of twin variants is still a matter of some controversy. To evaluate this role ordinary magnetostriction of different Ni-Mn-Ga single crystals transforming to 5M (exhibiting MIR) and NM (no MIR) martensite were measured. The magnetostriction of Ni-Mn-Ga austenite is relatively low and steeply increases when approaching to martensite transformation. This is correlated to the softening of elastic modulus. Observed high field contribution of opposite sign may be due to the dependence of higher order elastic constant on magnetic field. The magnetostriction of martensite is difficult to determine as it is masked by much stronger MIR effect and indirect method must be used. The results are discussed in the frame of magnetoelastic model for MIR and compared with magnetic energy model. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2011
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