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Correlation between Electronic Configuration and Magnetic Stability in Dysprosium Single Atom Magnets

Title
Correlation between Electronic Configuration and Magnetic Stability in Dysprosium Single Atom Magnets
Authors
Donati F.Pivetta M.Wolf C.Singha A.Wäckerlin C.Baltic R.Fernandes E.De Groot J.-G.Ahmed S.L.Persichetti L.Nistor C.Dreiser J.Barla A.Gambardella P.Brune H.Rusponi S.
Ewha Authors
Fabio DonatiWolf Christoph
SCOPUS Author ID
Fabio Donatiscopus; Wolf Christophscopus
Issue Date
2021
Journal Title
Nano Letters
ISSN
1530-6984JCR Link
Citation
Nano Letters vol. 21, no. 19, pp. 8266 - 8273
Keywords
density functional theorylanthanidesmultiplet calculationsscanning tunneling microscopySingle atom magnetsX-ray magnetic circular dichroism
Publisher
American Chemical Society
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Single atom magnets offer the possibility of magnetic information storage in the most fundamental unit of matter. Identifying the parameters that control the stability of their magnetic states is crucial to design novel quantum magnets with tailored properties. Here, we use X-ray absorption spectroscopy to show that the electronic configuration of dysprosium atoms on MgO(100) thin films can be tuned by the proximity of the metal Ag(100) substrate onto which the MgO films are grown. Increasing the MgO thickness from 2.5 to 9 monolayers induces a change in the dysprosium electronic configuration from 4f9 to 4f10. Hysteresis loops indicate long magnetic lifetimes for both configurations, however, with a different field-dependent magnetic stability. Combining these measurements with scanning tunneling microscopy, density functional theory, and multiplet calculations unveils the role of the adsorption site and charge transfer to the substrate in determining the stability of quantum states in dysprosium single atom magnets. © 2021 American Chemical Society.
DOI
10.1021/acs.nanolett.1c02744
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연구기관 > 양자나노과학연구소 > Journal papers
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