Magnetic properties of Co5Sm-Lodex and Co5Sm-lead composites

Demagnetization curves were recorded for composites of 1) Co
5
Sm and Lodex, 2) Co
5
Sm and lead, and 3) two different Co
5
Sm powders of widely different H
ci
values. "Kinks" observed for the first and third composites but not the second show that the effect results from the difference in H
ci
. The Co
5
Sm-Lodex composites produced "kinks" in only the 20-80 wt % Lodex range. Significant improvement of energy product in Lodex composites requires more than 70 wt % of Co
5
Sm. Better results can be obtained by diluting Co
5
Sm with lead. For applications operating at high load lines and requiring high inductions, improved properties may be obtained by small additions of Co
5
Sm to Lodex. Energy product and H
ci
can be improved for Co
5
Sm-lead composites by zinc coating the magnetic particles prior to pressing. One sample produced
BH_{\max}
values of 7.5 MGOe and H
ci
of 13.5 kOe.