Structural and magnetic properties of the half-ferromagnetic Co2+x+yMn1-xAl1-y alloys

AUTOR(ES)

Paduani, C., Migliavacca, A., Krause, J.C., Ardisson, J.D., Yoshida, M.I.

FONTE

Brazilian Journal of Physics

DATA DE PUBLICAÇÃO

2007-12

RESUMO

Co2+x+yMn1-xAl1-y intermetallic compounds have been prepared by arc melting and studied with X-ray diffraction and magnetization measurements to ascertain the effect of deviations of composition from the stoichiometry on the ferromagnetism of this system. Hysteresis loops registered at room temperature show a soft ferromagnetic behavior in excess Co. In off-stoichiometric alloys the saturation magnetization is lower than in Co2MnAl, whereas the Curie temperature T C is higher in all the studied alloys. T C varies substantially with variations in composition and increases with the Mn content. In the source of this behavior a volume effect is inferred which is expected to lead to strengthened ferromagnetic exchanges.

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