Dilution Effect on Nanographene Magnetic Properties

The magnetic properties of a diluted ferromagnetic-antiferromagnetic Ising model on a nanographene lattice, constituted of pure ferromagnetic layer with spin S=5/2 and diluted antiferromagnetic layer with a spin sigma=3/2, have been studied using Monte Carlo simulations. The considered Hamiltonian takes into account nearest-neighbor interactions, crystal field, and external magnetic field. The calculated magnetizations versus the dilution of the bonds in block A depend on the temperature, crystal field Delta, and external magnetic field h. The saturation magnetization and the magnetic remanent are also obtained for the two blocks.