MAGNETIC AND CALORIMETRIC STUDIES OF AMORPHOUS CO74FE4MN4B12SI6

The magnetization and thermal stability of Co74Fe4Mn4B12Si6 amorphous ribbons are studied. The Curie temperature determined from magnetizati on and differential scanning calorimetry measurements is T-C = 680 K. An activation energy of 3.84 eV, for the devitrification process, is d etermined from the Kissinger method. Our data, compared with those obt ained by other authors on amorphous FeBX (X = Nd, Ho, Er), show that a morphous Co74Fe4Mn4B12Si6 exhibits good thermal stability but not as g ood as metallic glasses doped with a rare earth metal.