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Annealing influence on the atomic ordering and magnetic moment in a Ni–Mn–Ga alloy.

AutorGutiérrez, J.; Chaboy, Jesús
Palabras claveFerromagnetic shape memory alloy
Magnetic ordering
Fecha de publicaciónsep-2007
CitaciónJournal of Magnetism and Magnetic Materials 316(2): 610-613 (2007)
ResumenWe have studied an alloy of composition Ni51Mn28Ga21 prepared by rapid quenching in the form of a ribbon, with transformation temperature TM=337 K below the magnetic-order temperature, TC=344 K. Annealing of the samples was performed at 600 K for different times. From magnetic characterization a clear increase of the saturation magnetization accompanied with an increase of TC (up to 20 K) and TM (about 10 K) has been observed. XMCD measurements of both as-quenched and annealed samples have revealed great changes for the Mn and also the existence of a strong Ni signal. These results point out a possible non-negligible role of Ni, through the polarization of the conduction band, into driving the interplay between annealing and the magnetic properties in these materials.
Descripción4 figures.
Versión del editorhttp://dx.doi.org/10.1016/j.jmmm.2007.03.043
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