Physics – Condensed Matter – Materials Science
Scientific paper
2004-01-31
Physics
Condensed Matter
Materials Science
3 figures, submitted to JMMM
Scientific paper
Three amorphous Co$_x$Nb$_{100-x}$ alloys, Co$_{25}$Nb$_{75}$, Co$_{57}$Nb$_{43}$ and Co$_{80}$Nb$_{20}$, were produced by Mechanical Alloying starting from the elemental powders. Their magnetic properties were determined using an alternating gradient force magnetometer (AGFM), and the remanent magnetizations, saturation fields and coercive fields were obtained from the hysteresis loop. The alloys have a relatively high saturation field, which decreases as the composition becomes richer in Co. The coercivity and remanent magnetization reach an optimal value around 57% at.Co, making {\em a}-Co$_{57}$Nb$_{43}$ the hardest magnetic material among the three alloys. Further addition of Co produces a soft alloy.
Campos C. E. M.
da Silva R. C.
de Lima João Cardoso
Gasperini A. A. M.
Grandi Tarciso Antonio
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