Cavallin, A.Fernandez, L.Ilyn, M.Magana, A.Ormaza, M.Matena, M.Vitali, L.Ortega, J. E.Grazioli, C.Ohresser, P.Rusponi, S.Brune, H.Schiller, F.2015-02-202015-02-202015-02-20201410.1103/PhysRevB.90.235419https://infoscience.epfl.ch/handle/20.500.14299/111427WOS:000346093400004We present a comprehensive study of the magnetism and morphology of an ultrahigh density array of Co nanoclusters self-assembled on the single atomic layer GdAu2 on Au(111) template surface. Combining scanning tunneling microscopy, x-ray magnetic circular dichroism, and magneto-optical Kerr effect measurements, we reveal a significant enhancement of the perpendicular magnetic anisotropy energy for noncoalesced single atomic layer nanoclusters compared to Co/Au(111). For coverages well beyond the onset of coalescence, we observe room-temperature in-plane magnetic remanence.text::journal::journal article::research article