Magnetic properties of disordered structures deposited on reconstructed substrates

The magnetic properties of disordered layered structures grown on surface-reconstructed substrates are studied with respect to percolation and random fields phenomena. Both the layered site-dilution and fluctuating magnetic field are considered in the frame of the Ising model to describe the structural disorder in a deposited layer. The results of effective field calculations superior to the standard molecular field approximation are qualitatively comparable with the experimental data previously obtained for Fe films deposited on GaAs(001) (4×2)-reconstructed surface.