Abstract
Neutron scattering methods are employed to study the temperature and magnetic field dependence of the spin dynamics in the alloy Fe/sub x/Cr/sub 1-x/ for x = 0.34, 0.28, 0.26, 0.24, and 0.22. For x = 0.34 and 0.28, the system orders ferromagnetically and exhibits well-defined spin waves throughout the ferromagnetic phase. For x< or =0.26, ferromagnetism is also present but at low temperatures a spin-glass-like phase exists. For these concentrations the spin-wave excitations are observed within the ferromagnetic phase but as the temperature is lowered towards the spin-glass regime the spin-wave frequency decreases. At low temperatures, within the spin-glass reigme, no well-defined excitations are present, but an intense quasielastic peak is observed. Application of a magnetic field causes a reemergence of the spin-wave excitations.
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