Feroz Alam Khan
Bangladesh University of Engineering and Technology, Bangladesh
Title: Influence of Mn substitution on magnetoresistance and magnetic properties of (Fe1-xMnx ) 75P15C10 alloy ribbons
Biography
Biography: Feroz Alam Khan
Abstract
Magnetic properties have been measured on a rapidly cooled melt spun (Fe1-xMnx )75P15C10 (x=0, 0.05, 0.1, 0.2 and 0.3) amorphous alloys ribbons. The amorphous property of the ribbons have been confirmed by X-ray diffraction and scanning electron microscopy analysis. The observed magnetic properties e.g. magnetization and magnetoresistance and the ac permeability indicate that (Fe1-xMnx )75P15C10 goes through a transition from the ferromagnetic to antiferromagnetic-like phase within the temperature range of observation. Both positive and negative magnetoresistance have been observed at room temperature for different electrical circuital configurations as a function of the applied magnetic field. Saturation magnetization (Ms ) and the low field coercivity (Hc ) at room temperature indicates the magnetic softness of the alloy. The temperature dependent ac permeability shows high effective permeability at room temperature and shows a permeability minima around 450K. The ac permeability shows a maximum around 1kHz and diminishes at the high-frequency regime. The magnetoresistance of all the samples goes through a minimum around 4kOe showing a spin-valve type behavior which may be attributed to the suppression of quantum localization of the spin moments.