Temperature evolution of martensitic structure in Ni-Mn-Ga single crystals

1Glavatsky, IM, 1Glavatska, NI
1G.V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Kosm. nauka tehnol. 2009, 15 ;(2):56-68
Publication Language: Ukrainian
We studied the temperature stability and evolution of crystal and magnetic structures in Ni-Mn-Ga-X (X = Cu, Fe) single crystals of non-stoichiometric composition with the modulated 10M and not modulated tetragonal 2M lattices of the martensitic phase. The correlation between structure changes and functional properties was investigated. The following methods were implemented: X-ray diffraction, neutronography, dilatometry, low-field magnetic susceptibility and measurements of a magneto-mechanical properties using magneto-dilatometric complex of a high resolution (100 nm). It is clarified that the crystal structure of the studied martensites is stable over the whole temperature range of their existence. The deep cooling (down to 4 K) leads to a strongly anisotropic change of the lattice parameters, which causes the restructuring of the twin and domain martensitic structures due to the relaxation of retained and thermal stresses. It is this fact that leads to a sharp change in the magnetic, magnetomechanical and transport properties during cooling down to about 200 K. The antiferromagnetic (AFM) ordering of the martensitic phase in the Ni-Mn-Ga-Cu-based alloys is observed for the first time The AFM component appears below 100 K and coexists,with the ferromagnetic ordering down to 4 K.
Keywords: crystals, magneto-mechanical properties, X-ray diffraction
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