Effects of pulsed field magnetization on the magnetic behaviour of R3Co compounds

Results are presented which indicate that the metamagnetic behaviour of the R 3 Co compounds is probably the consequence of a time dependent behaviour of the magnetization at low temperatures. Magnetization curves obtained in pulsed fields, are appreciably different from those obtained in static fields, and in general, open hysteresis loops are observed, along with much higher values of the critical fields. It appears that the critical field values may depend upon the rate of field increase.