Abstract
3He adsorbed on Graphite enables to create model 2D ferromagnetic Heisenberg systems. The exchange energies are of the order of 2 mK, typical sizes on the order of a thousand spins.By adding 4He (which is non magnetic) to the system, one can tune the effective size of one ferromagnetic domain. Up to now, the theoretical tools available did not allow a quantitative understanding of the magnetism of these clusters. For the first time, "engineered" ferromagnetic nano-clusters are compared to accurate theoretical models in order to understand the finite size effects. The experimental magnetization of a cluster of about 16 spins is compared to exact diagonalization and Monte-Carlo simulations based on the Heisenberg Hamiltonian.
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