Micromagnetic Theory of Phase Transitions in Inhomogeneous Ferromagnets. II. Applications

The influence is calculated of spatially random fluctuations of the Landau parameters A(r) and B(r) as well as the influence of inhomogeneous stress fields on the magnetic behaviour near the phase transition of inhomogeneous ferromagnets. In general this behaviour is determined by fluctuations of the Landau parameter A(r), whereas there is only a negligibly small contibution of spatially random fluctuations of B(r) and of inhomogeneous stress fields. The shifts of the ferromagnetic Curie temperatures due to the fluctuations of A(r) are of the order of magnitude of 1 to 10%. However, for actual material parameters only small curvatures are derived of the Arrott plots and the inverse paramagnetic susceptibility when considering spatially random fluctuations of A(r).