ANNEALING BEHAVIOR OF MAGNETIC-PERMEABILITY IN METALLIC GLASSES

The effect of thermal annealing on the magnetic permeability and Mossb auer spectra of the metallic glass Fe78Si9B13 have been studied. Mossb auer spectroscopy provides information about the atomic level changes associated with structural relaxation. It is found that the topologica l rearrangements start taking place at a temperature lower than that n eeded for relaxation of internal stresses. The magnetic permeability i s affected by both topological rearrangements as well as internal stre sses in the specimen. However, internal stresses have a stronger influ ence on the magnetic permeability.