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Effect of Annealing Temperature on the Complex Permeability of (Fe0.95Co0.05)73.5Cu1Nb3Si13.5B9 Nanocrystalline Amorphous Ribbon

Ratan Krishna Howlader, Sujit Kumer Shil, Shibendra Shekher Sikder and Dilip Kumar Saha

FINEMET-like amorphous ribbon of composition (Fe0.95Co0.05)73.5Cu1N b3Si13.5B9 was prepared by rapid quenching method in an Argon (Ar) atmosphere. The alloy has been annealed in a controlled way in the temperature range of 550 to 750°C for 30 minutes. Nanocrystalline state was evaluated by X-ray diffraction (XRD). In the range of annealing temperature (Ta), the grain size has been found in the range of 9-26 nm. Frequency dependence of permeability of amorphous and nanocrystalline toroid shaped samples have been measured. The low frequency initial permeability for the optimum annealed samples has been found to 5.8 × 103 and the highest value of quality factor is found for the sample annealed at 550°C; which also indicates the best heat treatment temperature.