0587729 - FZÚ 2025 RIV US eng J - Journal Article
Perevertov, Alexej - Colman, R.H. - Heczko, Oleg
Spin reorientation in premartensite and austenite Ni–Mn–Ga.
Applied Physics Letters. Roč. 125, č. 2 (2024), č. článku 021903. ISSN 0003-6951. E-ISSN 1077-3118
R&D Projects: GA MŠMT(CZ) EH22_008/0004591; GA ČR(CZ) GA22-22063S; GA ČR(CZ) GA24-10334S; GA MŠMT LM2023065
Institutional support: RVO:68378271
Keywords : magnetic shape memory alloy * Ni-Mn-Ga * premartensite * hysteresis loop * spin reorientation
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 4, year: 2022
Method of publishing: Open access

Premartensite state of Ni-Mn-Ga magnetic shape memory alloy, sometimes called the martensite precursor state, was studied by careful and detailed measurement of the evolution of magnetization curves of magnetically closed samples to evidence local symmetry breaking. During the heating cycle after the martensite transformation the magnetization loop slowly transforms from a typical sigmoidal shape, corresponding to the magnetization along the easy axis, to a constricted loop indicative of magnetization along a harder magnetic axis. These changes are explained by a switching of the macroscopic magnetic easy axis from [100] to [110]. Above the premartensite transformation temperature the magnetic easy axis slowly changes back to [100]. Cooling the sample starting from the Curie temperature the process reverses.
Permanent Link: https://hdl.handle.net/11104/0354835


Research data: Zenodo