The magnetic permeability enhancement effect in the Fe 86-x Nb x B 14 (x = 5, 6) amorphous alloys was studied by making use of magnetic measurements (permeability, coercive field, magnetization) and Mössbauer spectroscopy. It was shown that annealing for 1 h at elevated temperatures causes a significant increase of magnetic permeability and a reduction of material instabilities. The observed effect takes place in the so-called relaxed amorphous phase without forming any nanocrystallites and may be attributed to annealing out of free volume leading to formation of small iron clusters with different magnetic structures. . (a) 202, No. 13 (2005) / www.pss-a.com 2575

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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.