Abstract
An energy analysis of small-angle neutron scattering in FexNi1−x (x = 0.50, 0.57, 0.65 at %) alloys is performed at various temperatures and wavevectors. Low-energy long-wavelength magnetic excitations other than spin waves of the Holstein-Primakoff type are detected. These data and the data obtained earlier for the Fe0.65Ni0.35 alloy indicate that the density of states of the low-energy long-wavelength magnetic excitations correlates with the inhomogeneity of the magnetic structure of the alloys, which is caused by the iron concentration and a competing exchange interaction (JNiNi > 0, JFeNi > 0, JFeFe < 0).
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