Unconventional ferromagnetic and spin-glass states of the reentrant spin   glass Fe0.7Al0.3
  Spin excitations of single crystal Fe0.7Al0.3 were investigated over a wide range in energy and reciprocal space with inelastic neutron scattering. In the ferromagnetic phase, propagating spin wave modes become paramagnon-like diffusive modes beyond a critical wave vector q0, indicating substantial disorder in the long-range ordered state. In the spin glass phase, spin dynamics is strongly q-dependent, suggesting remnant short-range spin correlations. Quantitative model for S(energy,q) in the ``ferromagnetic'' phase is determined. 
Wei Bao, S. Raymond, S. M. Shapiro, K. Motoya, B. Fak and R. W. Erwin