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In the paper Fe82Nb2B16, Fe80Nb2B18 and Fe78Nb2B20 amorphous alloys, obtained by melt spinning, were examined. It was shown that the alloys studied in the as quenched state and in the relaxed amorphous state or in nanocrystalline state (after a suitable annealing) belong to very good soft magnetic materials with relatively high resistivity. The influence of annealing on brittleness as well as magnetic and electric properties measured at room temperature was examined. A correlation between sample microstructure (in the as quenched state and after annealing) and different physical properties is discussed. It was shown that the observed changes of relative magnetic permeability can be explained by changes of magnetoelastic energy, concentration of microvoids frozen during production process, effective anisotropy constant and magnetic polarisation.

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It has been shown that annealing of FeCu1XSi13B9 (X = Mn, Co, Zr) alloys at suitable temperatures T op and times τ p leads to an increase of the magnetic permeability and a decrease of the coercive force (optimisation effect of soft magnetic properties) determined at room temperature. The optimisation effect of soft magnetic properties in these alloys has been investigated by different experimental techniques. This effect has been attributed to the formation of a nanocrystalline phase, a change of the magnetostriction coefficient, stress, and a change of the concentration of microvoids. The diffusion parameters of the optimisation effect of soft magnetic properties, the Curie temperature and the temperatures of first and second stages of the crystallisation process have also been determined. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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