Journal
NANO LETTERS
Volume 21, Issue 19, Pages 8266-8273Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02744
Keywords
Single atom magnets; lanthanides; X-ray magnetic circular dichroism; scanning tunneling microscopy; density functional theory; multiplet calculations
Categories
Funding
- Institute for Basic Science [IBS-R027-D1]
- SNF Ambizione [PZ00P2_142474]
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By using X-ray absorption spectroscopy, the electronic configuration of dysprosium atoms on MgO(100) thin films can be adjusted by changing the MgO thickness from 2.5 to 9 monolayers, resulting in different magnetic stabilities. Hysteresis loops indicate long magnetic lifetimes for both configurations.
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 4f(9) to 4f(10). 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.
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