Physical Properties of Rare Earth-Cobalt Magnet Materials

termetallics, permanent magnets, samarium intermetallicsStudies have been undertaken to define the changes in properties which occur in rare earth- cobalt magnet materials in the temperature range up to 1000 C. A wide range of types of behavior of the time dependence of the magnetization at relatively low temperatures is observed. It is shown that the simple mechanisms for this time dependence do not apply. Unusual types of irreversibility are displayed, and these may be useful in applications, e.g., in some cases it would be advantageous to remagnetize after a number of hours at the operating temperature. X-ray measurements were carried out at high temperatures. Although some lattice parameter values were determined, it was not possible to gain much structural information because of rapid sample deterioration. Details of the mechanism of this deterioration are reported.