Abstract
The low-temperature magnetization of amorphous and nanocrystalline Fe 76.5− x U x Cu 1Si 13.5B 9 alloys ( x = 0–11) has been studied in the 4.2–300 K range. All examined magnetic parameters (exchange integral J, range of exchange interactions 〈 r 2〉, magnetic moment per Fe atom, μ Fe, spin wave stiffness constant D) are markedly influenced by the uranium substitution for iron. Both the μ Fe and D are found to increase with decreasing Fe content in amorphous alloys for x = 0 up to about 4. The noncollinear spin structures as a result of competing interactions are supposed to explain this behaviour. Some samples (with U contents of 2–6 at%) annealed for 1 h at 813 K appear to be nanocrystalline. Uranium seems to inhibit grain growth in the investigated FeUCuSiB system, just as Nb does in FeNbCuSiB nanocrystalline alloys.
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