Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 7: Electronic Structure of Surfaces: Magnetism and Spin Phenomena
O 7.2: Vortrag
Montag, 20. März 2017, 10:45–11:00, WIL C107
Superlattice of single atom magnets on graphene — •Romana Baltic1, Marina Pivetta1, Fabio Donati1, Christian Wäckerlin1, Aparajita Singha1, Jan Dreiser1,2, Stefano Rusponi1, and Harald Brune1 — 1Institute of Physics, Ecole Polytechnique Fédérale de Lausanne, Switzerland — 2Swiss Light Source, Paul Scherrer Institute, Switzerland
Regular arrays of single atom magnets represent the model systems for information storage at the ultimate length scales. In this regard, individual rare-earth atoms on decoupling layers have recently received great attention for showing extraordinary magnetic stability [F. Donati et al., Science 352, 318 (2016)]. However, they lack spatial order.
Here we show that the spatial arrangement of Dy atoms on graphene/Ir(111) can be controlled by the substrate temperature during their deposition. Deposition at 40 K leads to the formation of a regular array of Dy atoms with the periodicity defined by the graphene moiré pattern, while deposition at lower temperatures results in disordered systems. In addition, the Dy atoms in both configurations show magnetic hysteresis up to 5.6 T and spin lifetime of 1000 s at 2.5 K. The observed magnetic stability of Dy atoms is a consequence of the low intrinsic electron and phonon densities of graphene, the six-fold adsorption site, and the Jz = ± 7 ground state [R. Baltic et al., Nano Lett. (2016), DOI: 10.1021/acs.nanolett.6b03543].