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O: Fachverband Oberflächenphysik

O 72: Scanning Probe Techniques I: STM-ESR and Method Development (joint session O/CPP)

O 72.6: Vortrag

Mittwoch, 18. März 2020, 16:15–16:30, TRE Ma

Hyperfine fields of magnetic adatoms on ultrathin insulating films — •Sufyan Shehada, Manuel dos Santos Dias, Filipe Souza Mendes Guimarães, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany

Individual nuclear spin states can have a very long lifetime and could in principle be used as qubits. A promising step in this direction was the recent detection of the hyperfine interaction between the atomic nucleus and the surrounding electrons for single Fe and Ti adatoms on MgO/Ag(001) [1]. Here, we report on systematic first-principles calculations of the hyperfine fields of magnetic transition metal adatoms (from Ti to Cu) placed on different ultrathin insulators, such as MgO, NaCl, CuN and hBN. We analyze the trends and the dependence of the computed hyperfine fields on the filling of the magnetic d-orbitals of the adatom and on the type and strength of the bonding with the substrate, and what is the impact of an underlying metallic surface. We also identify promising candidates for future experimental investigation with scanning probe techniques.
This work was supported by the Palestinian-German Science Bridge BMBF program and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC-consolidator Grant No. 681405-DYNASORE).
[1] P. Willke et al., Science 362, 336–339 (2018)