Magnetostrictive behaviour and crystal structure of Fe-doped Ni-Mn-Ga-Co-In-Fe Metamagnetic Shape Memory Alloys
Ni-Mn-based magnetic shape memory alloys (MSMAs) are active materials that undergo martensitic transformations induced by temperature, stress and/or magnetic fields, leading to large recoverable mechanical transformations. As a result of the strong magnetoelastic coupling they show, these alloys can present large magnetostrains, due to either a reorientation of martensitic twin-variants or a magnetic-field induced martensitic transformation. Ni-Mn-Ga-Co-In alloys present a metamagnetic behaviour in their martensite phase, where stoichiometry controls the critical transformation temperatures: structural, TM, and magnetic, TC. When doped with Fe, these critical temperatures are affected, together with the magnetic properties of the alloys. It is well assessed that the cyclability of the magnetostriction depends on the hysteretic character (sharpness and temperature) of the structural transformation, that is highly influenced by the atomic positions. Within this context, we propose to carry out a neutron powder diffraction study with the goal of elucidating the role of the atomic site occupancies and the effect of Fe-doping in the magnetic and structural behaviour of the alloy series.
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RIO LOPEZ Natalia Ahiova; CHERNENKO Volodymyr; Bruna F. Gonçalves; LAZPITA Patricia; PLAZAOLA MUGURUZA Fernando; PORRO AZPIAZU Jose Maria; PUENTE ORENCH Ines and RODRIGUEZ VELAMAZAN Jose Alberto. (2023). Magnetostrictive behaviour and crystal structure of Fe-doped Ni-Mn-Ga-Co-In-Fe Metamagnetic Shape Memory Alloys. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-784
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