Ferromagnetic stability in Fe nanodot assemblies on cu(111) induced by indirect coupling through the substrate - J.P. Pierce; M.A. Torija; Z. Gai; Junten Shi; T.C. Schulthess; G.A. Farnan; J.F. Wendelken; E.W. Plummer; J. Shen (Physical Review Letters, 2004)