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In-situ studies of the martensitic transformation in epitaxial Ni-Mn-Ga films

SYSNO ASEP	0338431
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	In-situ studies of the martensitic transformation in epitaxial Ni-Mn-Ga films
Title	In-situ studie martensiticke transformace v epitaxialnich vrstvach Ni-Mn-Ga
Author(s)	Buschbeck, J. (DE) Niemann, R. (DE) Heczko, Oleg (FZU-D)_{RID, ORCID} Thomas, M. (DE) Schultz, L. (DE) Fähler, S. (DE)
Source Title	Acta Materialia. - : Elsevier - ISSN 1359-6454 Roč. 57, č. 8 (2009), s. 2516-2526
Number of pages	11 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	magnetic shape memory alloy ; martensitic phase transformation ; thin films ; interfaces ; twinning
Subject RIV	BM - Solid Matter Physics ; Magnetism
CEZ	AV0Z10100520 - FZU-D (2005-2011)
UT WOS	000265886900017
DOI	10.1016/j.actamat.2009.02.008
Annotation	The martensitic transformation of epitaxial Ni-Mn-Ga films is investigated with respect to changes of structure, microstructure, magnetic and electronic properties. Temperature dependent atomic force microscopy (AFM), X-ray, magnetization and resistivity measurements are performed in situ, during martensitic transformation of a 500 nm thick film. The combination of these methods gives a comprehensive understanding of the martensitic transformation and allows identifying differences of constrained epitaxial films. Experiments show the formation of a twinned, orthorhombic martensite with high uniaxial magnetocrystalline anisotropy from the austenite around room temperature. High resolution AFM micrographs directly reveal how martensite variants grow and show the converging of variants nucleated at different nucleation sites. The most observed features are in agreement with a first-order transformation in Ni-Mn-Ga bulk.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2010

Number of the records: 1