ANISOTROPY AND ROUGHNESS IN AS-QUENCHED CO66SI16B12FE4MO2 AMORPHOUS RIBBONS

The magnetic anisotropies of several disc-shaped samples of as-quenche d Co66Si16B12Fe4Mo2 have been measured by torque magnetometry. The sam ples were polished on both sides mechanically and electrolytically in order to study the influence of roughness on the anisotropy of this ki nd of samples of low magnetostriction and low Curie temperature. The r esults from torque magnetometry show that after mechanical polishing t he anisotropy of the sample practically vanishes, while in the case of electrolytic polishing the measured anisotropy increases. We can conc lude that the only detectable anisotropy in these samples originates i n the presence of oriented surface roughness. In the case of electroly tic polishing the mean anisotropy of the sample increases because the roughness is hardly altered, while the sample volume is considerably r educed.