Magnetic correlations in Cr–Fe–Mn alloy

Small angle neutron scattering (SANS) measurement has been performed on the reentrant ferromagnet Cr₆₀Fe₂₀Mn₂₀ alloy. An increase in the SANS intensity is observed below 100 K coinciding with an increase in the magnetization. It exhibits a maximum at 40 K and shifts to lower temperatures with increase in Q. The magnetic part of the SANS intensity fits to a Lorentzian at all temperatures. The temperature dependence of the inverse correlation length exhibits a minimum at 40 K. In the antiferromagnetic spin-glass phase at 15 K ferromagnetic correlations of ~40 Å is observed.