MAGNETIZATION PROCESSES AND MAGNETIC VISCOSITY OF MECHANICALLY ALLOYED SMCO5

Mechanically alloyed SmCo5 materials with coercivities in the range of 50-75 kOe were studied in this work. Irreversible magnetisation proce sses were investigated by measuring remanences after initial magnetisa tion and after deviation of the demagnetisation remanence from the Woh lfarth relationship indicated that interactions between grains play an important role in the irreversible magnetisation process. Viscosity t ests showed nearly linear relationship between the magnetic field and the viscosity parameter for the initial magnetisation, while the visco sity was not strongly dependent on the field for the demagnetisation. High values of the viscosity parameter, Lambda, between 120 to 220 Oe were measured at fields near coercivity.