Abstract:
Electrical and Magnetic transport properties of Fe78B10Si12 (FINEMET) metallic ribbons prepared by standard melt-spinning technique have been investigated. Fe78B10Si12 shows conventional anisotropic magneto resistance (MR) which is found to vary from 0 - 15% with the external magnetic field. An external transducer is used to vibrate the sample in an external magnetic field and to investigate the dynamic behavior of the sample. It is observed that a small self-induced ac voltage is super imposed 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 30o- 550o) on the resistivity of the sample is measured and the glass transition temperature, Tg of the alloy is estimated from the dc resistivity anomaly observed at the elevated temperature. The frequency dependent response of impedance, phase angle, permeability, permittivity, Quality factor, Dissipation factor are also studied by Wayne Kerr Impedance Analyzer with frequency range of 100Hz-100MHz. 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.
Description:
Supervised by
Dr. Md. FerozAlam Khan,
Professor,Department of Physics, Bangladesh University of Engineering and Technology, Dhaka-1000, Bangladesh
