Equivalence of mechanical and magnetic force in magnetic shape memory effect

0452922 - FZÚ 2016 RIV PL eng C - Konferenční příspěvek (zahraniční konf.)
Kopecký, Vít - Perevertov, Oleksiy - Straka, L. - Ševčík, Martin - Heczko, Oleg
Equivalence of mechanical and magnetic force in magnetic shape memory effect.
Acta Physica Polonica A, vol. 128, č. 4. Warsaw: Polish Academy of Sciences, 2015, s. 754-757. ISSN 0587-4246. E-ISSN 1898-794X.
[International Symposium on Physics of Materials /13./. Praha (CZ), 31.08.2014-04.09.2014]
Grant CEP: GA ČR GB14-36566G
Institucionální podpora: RVO:68378271 ; RVO:61388998
Klíčová slova: MSM * Ni-Mn-Ga * magnetic stress
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus

High mobility of twin boundary is crucial for magnetic shape memory (MSM) effect. The twin boundary can be moved by applied magnetic field or mechanical stress. In Ni-Mn-Ga 10M martensite there are two different, field-movable, a-c twin boundaries Type I and II due to monoclinic lattice. For single twin boundary of both types we experimentally evaluated the equivalence of magnetic and mechanical force and the validity of generally used energy model using direct stress-strain and magnetization measurements. For Type II, highly mobile twin boundary, the equivalence seems to be valid and model broadly agrees with measurement. However, for Type I the calculated magnetic stress is much larger than mechanical stress needed for twin boundary motion.
Trvalý link: http://hdl.handle.net/11104/0253822