Site occupancy study of Fe doped Ni45Co5Mn25-xFexGa20Cu5 (x =4 and 5) Heusler single crystals
Recently, Ni-Mn-Ga based high temperature magnetic shape memory alloys have become the focus of intense research due to the observation of magnetic-field-induced strain at high temperatures, giving rise to many potential applications as contactless actuators in areas such as aerospace or automotive industries. For these compounds, the martensitic structure and magnetic order are key parameters for the output strain obtained and shown to be extremely sensitive to the composition of the alloys. We propose to carry out a neutron diffraction study in order to clarify experimentally the influence of the Fe addition on the martensitic transformation in two single crystalline samples of composition Ni45Co5Mn25-xFexGa20Cu5 (x= 4 and 5). In these alloys, the effect of the Fe doping promotes a simultaneous increase of Curie temperature and spontaneous magnetization, but a decrease of the martensitic transformation temperatures. The accurate knowledge of the site occupancies will be very important in order to properly analyze the results from polarized neutrons (PN), that will be carried out in the same samples.
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A. Perez-Checa; BARANDIARAN Jose Manuel; CHERNENKO Volodymyr; FEUCHTWANGER Jorge; J. Gutierrez; LAZPITA Patricia; MONDELLI Claudia; PORRO AZPIAZU Jose Maria; RODRIGUEZ VELAMAZAN Jose Alberto and SOZINOV Alexei. (2018). Site occupancy study of Fe doped Ni45Co5Mn25-xFexGa20Cu5 (x =4 and 5) Heusler single crystals. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-15-623
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