The influence of post-annealing cooling rates on magnetic properties of Fe-based nanocrystalline alloys

The Fe73.5Cu1Nb3Si22.5-xBx melt-spinning samples have been investigated at amorphous and nanocrystalline states. They were annealed at 548degreesC for 0.5 or 1 h and then cooled with different rates. The effect of the cooling rates was studied by X-ray diffraction, measurement of effective permeability and hysteresis loops and using the ferromagnetic resonance technique. The observed changes of structural properties, permeability, coercivity, remanence, as well as linewidth and resonance field of the FMR spectra with varying annealing parameters are discussed. (C) 2002 Elsevier Science B.V. All rights reserved.