Baltic, RomanaPivetta, MarinaDonati, FabioWäckerlin, ChristianSingha, AparajitaDreiser, JanRusponi, StefanoBrune, Harald2017-01-092017-01-092017-01-09201610.1021/acs.nanolett.6b03543https://infoscience.epfl.ch/handle/20.500.14299/132536WOS:000389963200043Regular arrays of single atoms with stable magnetization represent the ultimate limit of ultrahigh density storage media. Here we report a self-assembled superlattice of individual and noninteracting Dy atoms on graphene grown on Ir(111), with magnetic hysteresis up to 5.6 T and spin lifetime of 1000 s at 2.5 K. The observed magnetic stability is a consequence of the intrinsic low electron and phonon densities of graphene and the 6-fold symmetry of the adsorption site. Our array of single atom magnets has a density of 115 Tbit/inch(2), defined by the periodicity of the graphene moire pattern.Single atom magnetsself-assemblysuperlatticerare earth atomsgrapheneXMCDtext::journal::journal article::research article