Browsing by Author "Garitaonandia, JS"

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    Ferromagnetic resonance study of Fe rich Fe-Al intermetallic alloys
    (Elsevier, 2007-09) Rodríguez, DM; Schmool, DS; Garitaonandia, JS; Plazaola, F
    With the aim of studying the evolution of the magnetic clusters present in Fe-Al alloys around 30 at% Al with temperature we have used ferromagnetic resonance (FMR). FMR is a very powerful technique for magnetic characterisation of materials. In multiphase magnetic materials, FMR provides information about the magnetic exchange coupling that may exist between the various magnetic phases. In the present work we report study of 4 alloys with compositions Fe69.5Al30.5, Fe70Al30, Fe70.5Al29.5 and Fe72.5Al27.5. The resonance field shows strong temperature dependence. Despite the small composition variations between the studied samples, the resonance field temperature dependence varies significantly. This indicates that the magnetic cluster structure is strongly dependent on composition. Moreover, the FMR field shows magnetic transition temperatures already reported by other techniques. © 2007, Elsevier Ltd.
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    Structural study of the re-entrant spin-glass behaviour of Fe-Al alloys
    (Elsevier, 2007-09) Rodríguez, DM; Plazaola, F; Garitaonandia, JS; Cuello, GJ
    Neutron powder diffraction measurements were performed on Fe70Al30 alloy in order to determine the relationship between the magnetic behaviour and the structural changes observed in this alloy. Results show that the re-entrant spin-glass behaviour is linked with D03 structure. There is a strong correlation between the lattice parameter and the diffraction peak intensity and all the magnetic changes reported in literature can be explained in terms of this relationship. Finally, magnetovolume effects similar to invar effect are reported in the spin-glass phase. © 2007, Elsevier Ltd.