Electrical and Magnetic Transport Properties of Nanocrystalline Fe sub(73.5)Si sub(13.5)B sub(9)Cu sub(1)Nb sub(3) Alloy

Electrical and magnetic transport properties of Fe sub(73.5)Si sub(13.5)B sub(9)Cu sub(1)Nb sub(3) (FINEMET) metallic ribbons prepared by standard melt-spinning technique have been investigated through dc and ac magnetic as well as electrical properties. Fe sub(73.5)Si sub(13.5)B sub(9)Cu sub(1)Nb sub(3) shows conventional anisotropic magnetoresistance (MR) which is found to vary from 1 to 15 %. The dynamic behaviour of the sample vibrating at a constant frequency with the help of an external transducer in an external magnetic field is investigated. It is observed that a small self-induced ac voltage is superimposed on the dc response of the sample. This small ac signal is observed to be periodic in nature and may be attributed to the presence of non-magnetic metallic species in the ribbon. The effect of temperature (ranging from 30 to 550 degree C) on the resistivity of the sample is measured and the glass transition temperature (T sub(g)) of the alloy is estimated from the dc resistivity anomaly observed at the elevated temperature. The frequency dependent responses of permeability, quality factor and dissipation factor are studied by Wayne Kerr impedance analyser with frequency range of 100 Hz-100 MHz. The observed electrical and magnetic properties of the material indicate that the alloy in its ribbon form is suitable for its potential use in electrical and magnetic switching devices.