title: Superlattice of Single Atom Magnets on Graphene.
abstract: Regular 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/inch2, defined by the periodicity of the graphene moiré pattern.
authors: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland.
authors: Romana
authors: R
authors: Baltic
authors: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland.
authors: Marina
authors: M
authors: Pivetta
authors: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland.
authors: Fabio
authors: F
authors: Donati
authors: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland.
authors: Christian
authors: C
authors: Wäckerlin
authors: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland.
authors: Aparajita
authors: A
authors: Singha
authors: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland.|Swiss Light Source, Paul Scherrer Institute , CH-5232 Villigen PSI, Switzerland.
authors: Jan
authors: J
authors: Dreiser
authors: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland.
authors: Stefano
authors: S
authors: Rusponi
authors: Institute of Physics, Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne, Switzerland.
authors: Harald
authors: H
authors: Brune
keywords: Single atom magnets; XMCD; graphene; rare earth atoms; self-assembly; superlattice