Influence of Crystal Structure on the Magnetic Percolation Threshold in Ultrathin Films

Abstract. In this paper, we modelled the phase transition between ferromagnetic and paramagneticstates in ultrathin films of different crystal structure near the percolation transition. Properties of ultrathinfilms have been studied within the framework of Ising model and the method of random-fieldinteraction. It is shown that the critical concentration of such phase transition depends on the symmetryof crystal lattice of the material. The increase in the film thickness leads to a decrease of the criticalconcentration up to a value of the percolation threshold of a massive sample of the correspondingcrystal structure.