Abstract: Magnetic feature of a two-dimension ferromagnetic/antiferromagnetic random diluted magnetic system is studied by micromagnetism and Monte Carlo method. The step effect of M-H magnetization curve is found in this system, and discussed with the one-dimension Ising model, which covers the energy of system and the spin configuration. It's found that the step effect can be produced in the antiferromagnetic coupling system with small number of spins.

Key words: micromagnetism, step effect, magnetization, diluted magnetic system