CUBIC MODELS WITH RANDOM ANISOTROPY

A Monte Carlo algorithm has been used to study the cubic ferromagnet w ith a random uniaxial single-site anisotropy on simple cubic lattices, in the strong anisotropy limit. For both two-component and three-comp onent spins the phase diagram contains a ''domain-type'' ferromagnetic phase for strong random anisotropy, in addition to the simple ferroma gnetic phase which is seen for weak random anisotropy. For two-compone nt spins both paramagnet-ferromagnet transitions seem to be second ord er. For three-component spins the magnetization probably disappears di scontinuously, and there appears to be a thin layer of infinite suscep tibility phase between the paramagnetic and ferromagnetic phases.