Abstract
The low-temperature magnetization behaviour of ferromagnetic Fe 73.5Nb 3− x U x Cu 1Si 13.5B 9 ( x = 0, 1, 2, 3) and Fe 73.5U 4Si 13.5B 9 alloys in the amorphous and partially crystallized states was studied. The experimental data can be explained by means of the usual spin wave model. The spin wave stiffness constant D, the range of the exchange interaction 〈 r 2〉, the exchange constant A and the magnetic moment per Fe atom μ Fe were determined. We have found that all these parameters are strongly affected by the substitution of Nb and Cu by U atoms.
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