Resonant ultrasound spectroscopy - a tool to probe magneto-elastic properties of ferromagnetic shape memory alloys

0393986 - FZÚ 2014 RIV DE eng J - Journal Article
Heczko, Oleg - Seiner, Hanuš - Sedlák, Petr - Kopeček, Jaromír - Kopecký, Vít - Landa, Michal
Resonant ultrasound spectroscopy - a tool to probe magneto-elastic properties of ferromagnetic shape memory alloys.
European Physical Journal B. Roč. 86, č. 2 (2013), s. 1-5. ISSN 1434-6028. E-ISSN 1434-6036
R&D Projects: GA ČR(CZ) GA101/09/0702; GA ČR GAP107/10/0824; GA ČR(CZ) GAP107/11/0391
Institutional support: RVO:68378271 ; RVO:61388998
Keywords : elastic properties of ferromagnetic martensite * ferromagnetic shape memory alloys * Resonant ultrasound spectroscopy * Ni-Mn-Ga
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.463, year: 2013

Resonant ultrasound spectroscopy (RUS) was used to investigate the changes of elastic properties induced by magnetic field in magnetic shape memory alloys Ni-Mn-Ga and Co-Ni-Al. In contrast to large magneto-elastic response of Ni2MnGa austenite, there is only very weak response of Co-Ni-Al. This indicates that the austenite phase of Ni-Mn-Ga can have a privileged position and this may be a reason for the existence of magnetic shape memory effect. In contrast to austenite, the magneto-elastic response in Ni-Mn-Ga martensite is very small with large damping due to existence of twin boundaries. The measurement showed that RUS can be a powerful method to probe magneto-elastic properties of shape memory alloys.
Permanent Link: http://hdl.handle.net/11104/0222321