REVERSIBLE AND IRREVERSIBLE DOMAIN-WALL MOVEMENT IN METGLAS AMORPHOUS RIBBONS

Magnetization mechanisms in Metglas(R) 2605 ferromagnetic amorphous ribbons have been investigated by Impedance Spectroscopy. At applied fields below 14 mOe, permeability was independent of frequency up to approximately 0.5 MHz, where a relaxation occurs. For higher applied fields, the permeability at low frequencies was a function of applied field. A complex dispersion towards the low field value occurs at approximately 5 kHz. The different character of these two magnetization mechanisms has been demonstrated by means of complex permeability plots. The low field permeability is associated with reversible domain wall movement and the high field mechanism with irreversible domain wall movement.