Magnetic properties of Co5Sm-Lodex and Co5Sm-lead composites

Demagnetization curves were recorded for composites of 1) Co5Sm and Lodex, 2) Co5Sm and lead, and 3) two different Co5Sm powders of widely different Hcivalues. "Kinks" observed for the first and third composites but not the second show that the effect results from the difference in Hci. The Co5Sm-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 Co5Sm. Better results can be obtained by diluting Co5Sm with lead. For applications operating at high load lines and requiring high inductions, improved properties may be obtained by small additions of Co5Sm to Lodex. Energy product and Hcican be improved for Co5Sm-lead composites by zinc coating the magnetic particles prior to pressing. One sample produced values of 7.5 MGOe and Hciof 13.5 kOe.