Abstract
We investigated the atomic dynamics and the mag- netic properties of the Cu100−x Fex system. Samples with nominal Fe concentrations of 5, 17.5, 30 and 45 at. % were prepared in the same manner by mechanical alloying in a planetary ball mill. All samples are nanocrystalline super- saturated solid solutions, without crystalline bcc Fe phase or amorphous matrix. They have both ferromagnetic and anti- ferromagnetic order at 5 K, but the antiferromagnetic state transforms to a paramagnetic one well below room tempera- ture. The inelastic neutron scattering measurements were per- formed at room temperature at FOCUS (PSI, SINQ). With increasing Fe concentration we additionally observed low- energy, most likely transverse modes in the dynamic structure factor.
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