Abstract
The magnetic excitations and instantaneous spatial correlations have been studied in amorphous (FexCr1−x)75P15C10 using neutron inelastic scattering and small-angle neutron scattering (SANS). We report here the results for the sample with x=0.7, which is in the reentrant spin-glass region (RSG) of the magnetic phase diagram. As in other materials displaying RSG properties, we find conventional spin-wave behavior for temperatures down to about half the Curie temperature (TC=134 K), but decreasing excitation energies and lifetimes as the temperature is further lowered. We have studied the critical scattering near TC with SANS, and find that the transverse correlation length ‘‘diverges’’ provided that the data analysis includes the longitudinal fluctuations. The longitudinal correlation length decreases rapidly below TC as expected in a conventional ferromagnet, and the amplitudes for transverse and longitudinal scattering have the expected 2:1 ratio. The RSG temperature regime is characterized by the appearance of a Lorentzian-squared term in the scattering function with a ‘‘nondiverging’’ correlation length, and an amplitude proportional to the RSG order parameter.
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