MAGNETIZATION STUDY OF CO-FE-MN-B-SI AMORPHOUS-ALLOYS

We have studied the magnetization of melt spun amorphous (Co1 - xFex)( 74)Mn8B12Si6 alloys with 0 less than or equal to x less than or equal to 0.15. The magnetic moment of the amorphous alloys increases linearl y at 4.2 K with addition of Fe. From the usual values of Co and Fe mom ents, and based on the charge transfer model, the Mn moment is estimat ed to be 3.5 mu(B). The approach to saturation is established in the f orm of 1/H-1/2 for the various samples. Therefore, it is considered th at the exchange interaction between the nearest neighbor T (T = Co, Fe and Mn) atoms: is dominantly ferromagnetic. The exchange constant, lo cal random anisotropy constant, and ferromagnetic correlation length h ave been calculated.