Magnetic field dependence of the small angle scattering in amorphous DyCu

The previously reported small angle neutron scattering (SANS) from the spin glass amorphous DyCu (TF =17 K) was examined in applied fields up to 15 kOe. Application of the field caused a decrease of the total SANS intensity and a decrease of the correlation length derived from the Lorentzian line shapes to ∼6 A from the zero field value of 13.5 A. Field‐cooling and relaxation effects were also observed in the SANS intensity and are compared with similar phenomena in magnetization measurements.