Influence of Cu addition on structural and magnetic properties of Ni50Mn25-xGa25Cux (x = 3, 6 and 9) metamagnetic shape memory alloys
Heusler shape memory alloys represent new multifunctional materials capable of controllable activated twin boundary motion. NiMnGa alloys have shown extremely large field-induced strains (12% at RT). Studies of the dependence of the magnetic moment with composition conclude that the magnetic interactions of the Mn atoms are very sensitive to the exact lattice site occupancy of the different atoms. Cu-doping of Ni2MnGa alloys allows smooth adjustment of the magnetic and structural transition temperatures. The doped compounds show a metamagnetic phase transformation, resulting in a large magnetization difference across the transformation. These doped alloys are excellent candidates for technical applications due to the large magnetocaloric and giant magnetoresistance effects they present. Here we present a series of metamagnetic shape memory alloys with varying Mn and Cu content, where the relative compositions of both elements in the alloy affect their transition temperatures. 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 in the magnetic and structural behavior of the alloy series.
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PORRO AZPIAZU Jose Maria; CESARI Eduard; J. Gutierrez; LAZPITA Patricia; MONDELLI Claudia; A. Perez-Checa; RODRIGUEZ VELAMAZAN Jose Alberto and Segui, C.. (2020). Influence of Cu addition on structural and magnetic properties of Ni50Mn25-xGa25Cux (x = 3, 6 and 9) metamagnetic shape memory alloys. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2707
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