0535225 - FZÚ 2021 RIV PL eng J - Journal Article
Frol'ová, Lucia - Ryba, C. - Heczko, Oleg - Kmjec, T. - Fekete, Ladislav - Kopeček, Jaromír - Vargová, Z. - Varga, R.
Structural order, martensitic transformation and magnetic domains in Ni–Fe–Ga shape memory microwire.
Acta Physica Polonica A. Roč. 137, č. 5 (2020), s. 989-992. ISSN 0587-4246. E-ISSN 1898-794X
R&D Projects: GA MŠMT(CZ) LO1409; GA MŠMT(CZ) LM2015088; GA ČR GA19-09882S
Institutional support: RVO:68378271
Keywords : shape memory alloys * martensitic transformation * microwire * Mössbauer spectroscopy
OECD category: Physical chemistry
Impact factor: 0.577, year: 2020
Method of publishing: Open access
https://doi.org/10.12693/APhysPolA.137.989

We investigate Ni50Fe27Ga23 prepared as glass-coated microwires by the Taylor–Ulitovsky method.Temperature-induced martensitic transformation was observed by cooling in liquid nitrogen using optical microscope. From cubic austenite the wire transformed to heavily twinned martensitic phase. The magnetic domain structure (domain size and orientation) and its evolution were observed by magnetic force microscope at the same place after the sample was magnetized in three perpendicular directions. Surprisingly, after various magnetizing the domain structure stayed similar, and changes were minor.This probably happened due to presence of antiphase boundaries on which the domain walls are pinned. The Mössbauer spectroscopy determines the ratio between ten percent of Fe atoms in non-magnetic state and the magnetically ordered phase with L21 order which is typical for austenite.
Permanent Link: http://hdl.handle.net/11104/0313302