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Elasticity and magnetism of Ni 2 MnGa premartensitic tweed
Author(s) -
Seiner Hanuš,
Kopecký Vít,
Landa Michal,
Heczko Oleg
Publication year - 2014
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201350415
Subject(s) - softening , condensed matter physics , materials science , diffusionless transformation , magnetostriction , magnetism , martensite , shear (geology) , microstructure , metallurgy , magnetic field , physics , composite material , quantum mechanics
Magnetic, magneto‐elastic and elastic measurements were used to characterize the thermal evolution of the premartensite phase of Ni 2 MnGa. The premartensitic transition is shown to correspond to a sharp maximum of magnetostriction and a pronounced minimum of the (110) 〈 1 1 ‾ 0 〉 shear stiffness (the c ′ elastic coefficient); no additional softening of the c ′ coefficient prior to the martensitic transformation was observed. In contrast, a significant softening of the (100) 〈 010 〉 stiffness (the c 44 elastic coefficient) was observed in the vicinity of the martensitic transition, while this coefficient is fully unaffected by the premartensitic transition. A simple two‐dimensional model of the tweed is presented to explain this mutual independence between the c ′ and c 44 shears and the effect of tweed formation on both of them.