title: Structural and magnetization changes at high temperature in Co50Mn30In20 alloy.
abstract: In this work we report on microstructural and magnetic characterization of Co50Mn30In20 alloy melt-spun ribbons in its as-cast state and after being annealed at 923 K during 5 h. Microstructure was analysed by means of differential scanning calorimetry (DSC), X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) techniques, while magnetic measurements (hysteresis loop and magnetization) were performed in the temperature range 1.8-1000 K. XRD measurements confirm the presence of Heusler phase Co2MnIn in the annealed material with crystallites sizing around 35 nm. Ferromagnetic ordering temperatures in Co-based Heusler systems (Co2MnIn) are considerably higher than in the corresponding Ni2MnIn ones. In this case, T(c) = 520 K for the annealed sample is lower than the corresponding one (T(c) = 550 K) for the as-cast ribbon. At around 840 K, the very abrupt magnetization change for the annealed sample is higher than the one obtained for the as-cast ribbon. This temperature value is the same than the recrystallization phase transition temperature detected in the DSC measurement.
authors.affiliation: Dpto. Física de Materiales, UPV/EHU, Apdo. 1072, 20080 San Sebastián, Spain.
authors.forename: Mst
authors.initials: M
authors.lastname: Nazmunnahar
authors.forename: Lorena
authors.initials: L
authors.lastname: González
authors.forename: Maxim
authors.initials: M
authors.lastname: Ilyn
authors.forename: Juan José
authors.initials: JJ
authors.lastname: del Val
authors.forename: Joan Josep
authors.initials: JJ
authors.lastname: Suñol
authors.forename: Blanca
authors.initials: B
authors.lastname: Hernando
authors.forename: Julián
authors.initials: J
authors.lastname: González