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O: Fachverband Oberflächenphysik
O 81: Poster Session VI: Poster to Mini-Symposium: Manipulation and control of spins on functional surfaces II
O 81.4: Poster
Wednesday, March 3, 2021, 13:30–15:30, P
Engineering atomic-scale magnetic fields by dysprosium single atom magnets — •Aparajita Singha1,2,3, Philip Willke1,2,4, Tobias Bilgeri5, Xue Zhang1,2, Harald Brune5, Fabio Donati1,2, Andreas Heinrich1,2, and Taeyoung Choi1,2 — 1Center for Quantum Nanoscience, Institute for Basic Science (IBS), Republic of Korea — 2Ewha Womans University, Republic of Korea — 3Max-Planck-Institut für Festkörperforschung, Germany — 4Physikalisches Institut, KIT, Germany — 5Institute of Physics, EPFL, Switzerland
Atomic-scale engineering of magnetic fields is a key ingredient for miniaturizing quantum devices and precision control of quantum systems. This requires a unique combination of magnetic stability and spin-manipulation capabilities. Surface-supported single atom magnets [1,2] offer such possibilities, where long temporal and thermal stability of the magnetic states can be achieved by maximizing the magnetic anisotropy and by minimizing quantum tunnelling of the magnetization. Here, we show that dysprosium atoms adsorbed on magnesium oxide have a giant anisotropy of 250 meV, currently the highest among all surface spins. Using a variety of STM techniques including single atom electron spin resonance [3], we confirm no spontaneous spin-switching in these atoms over days at ≈ 1 K under low and even at vanishing magnetic fields. We utilize these robust single atom magnets to engineer magnetic nanostructures, demonstrating unique control of magnetic fields with atomic-scale tunability. [1] Science 352, 318 (2016); [2] Nature 543, 226 (2017); [3] Science 350, 417 (2015).