J Mater Sci Technol ›› 2012, Vol. 28 ›› Issue (1): 21-26.

• Nanomaterials and Nanotechnology • Previous Articles     Next Articles

Influence of Annealing Conditions on Nanocrystalline and Ultra-Soft Magnetic Properties of Fe75.5Cu1Nb1Si13.5B9 Alloy

S.P. Mondal, Kazi Hanium Maria, S.S. Sikder, Shamima Choudhury, D.K. Saha,  M.A. Hakim   

  1. 1) Department of Physics, Khulna University of Engineering & Technology, Khulna-9203, Bangladesh
    2) Department of Physics, University of Dhaka, Dhaka-1000, Bangladesh
    3) Materials Science Divisions, Atomic Energy Centre, Dhaka-1000, Dhaka, Bangladesh
  • Received:2011-05-23 Revised:2011-12-25 Online:2012-01-30 Published:2012-01-19
  • Contact: Kazi HaniumMaria

Abstract: The magnetic and structural properties of FINEMET alloy with a composition of Fe75.5Cu1Nb1Si13.5B9 were investigated after primary and secondary crystallization of amorphous ribbon sample. The crystallization behavior and the nanocrystal formation of the samples were performed by differential thermal analysis (DTA) which in turn was supported by X-ray diffraction (XRD) study. Temperature dependence of initial permeability of amorphous and devitri¯ed toroid shaped samples has been measured. Enhancement of Curie temperature of the amorphous alloy has been observed due to the irreversible structural relaxation. With the appearance of nanocrystalline phase the Curie temperature of the residual amorphous phase gradually decrease with the increase of annealing temperature. Their temperature dependence reflects the characteristic annealing temperature evolution of the basic magnetic parameters in these nanocrystalline systems. Saturation magnetization, Ms, increases with annealing temperature Ta for the samples and finally decreases during annealing at a temperature much higher than peak crystallization temperature.

Key words: Nanostuctured alloy, Curie temperature, Saturation, Magnetization