Longitudinal spin fluctuations in the nearly isotropic ferromagnet CdCr2Se4:: Scaling behavior outside the critical region

The uniform dynamics of nearly isotropic cubic ferromagnet CdCr2Se4 in the ordered phase is investigated. It is found that the longitudinal susceptibility behaves as chi(alpha)omega(-rho) with p approximate to 0.28. The low-frequency crossover to omega(-rho) dependence is induced by the internal magnetic field H-i. We attribute the observed anomalous behavior to the influence of dipolar forces and propose a description of chi(omega,H-i) in terms of phenomenological scaling.