Large Non-ergodic Magnetoelastic Damping in Ni-Mn-Ga Austenite

0535846 - ÚT 2021 RIV DE eng J - Journal Article
Bodnárová, Lucie - Sedlák, Petr - Heczko, Oleg - Seiner, Hanuš
Large Non-ergodic Magnetoelastic Damping in Ni-Mn-Ga Austenite.
Shape Memory and Superelasticity. Roč. 6, č. 1 (2020), s. 89-96. ISSN 2199-384X. E-ISSN 2199-3858
R&D Projects: GA ČR(CZ) GA17-00062S
Institutional support: RVO:61388998 ; RVO:68378271
Keywords : ferroelasticity * martensite * NiMnGa * premartensite transformation * elastic damping
OECD category: Condensed matter physics (including formerly solid state physics, supercond.); Condensed matter physics (including formerly solid state physics, supercond.) (FZU-D)
Method of publishing: Limited access
https://link.springer.com/article/10.1007/s40830-020-00272-4

Resonant ultrasound spectroscopy was used to analyze magnetoelastic damping in Ni-Mn-Ga single crystals in austenite and premartensite phases. Crystals with different treatment were studied, exhibiting different density of antiphase boundaries (APBs), as confirmed by magnetic force microscopy, and different magnetic behavior. For a quenched single crystal with high density of APBs, extremely strong damping was observed in a broad temperature range in the austenite phase. It was shown that this damping is history-dependent, i.e., non-ergodic, appearing only during heating runs preceded by a premartensite-austenite transition.
Permanent Link: http://hdl.handle.net/11104/0315729