The generalised susceptibility of FCC Mn(38%Ni) alloy

Essential differences in spin dynamics between Mn–Ni and Mn–Fe alloys motivated extended studies of these systems. Within these studies the uniaxial anisotropy of the critical scattering found earlier in FCC Mn(38%Ni) alloy suggested the investigation of the anisotropy of the spin-wave (SW) velocity in this alloy. The present data give the first clear evidence of the uniaxial anisotropy of the SW velocity for a 3d metal system with the full cubic symmetry.