Structural and magnetic properties of the half-ferromagnetic Co2+x+yMn1-xAl1-y alloys
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 temperat...
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Published in | Brazilian journal of physics Vol. 37; no. 4; pp. 1284 - 1287 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English Portuguese |
Published |
Sociedade Brasileira de Física
01.12.2007
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Subjects | |
Online Access | Get full text |
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Summary: | 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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ISSN: | 0103-9733 1678-4448 0103-9733 |
DOI: | 10.1590/S0103-97332007000800015 |