Understanding the Superior Stability of Single-Molecule Magnets on an Oxide Film

Michał Studniarek, Christian Wäckerlin, Aparajita Singha, Romana Baltic, Katharina Diller, Fabio Donati, Stefano Rusponi, Harald Brune, Yanhua Lan, Svetlana Klyatskaya, Mario Ruben, Ari Paavo Seitsonen, Jan Dreiser

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

The stability of magnetic information stored in surface adsorbed single-molecule magnets is of critical interest for applications in nanoscale data storage or quantum computing. The present study combines X-ray magnetic circular dichroism, density functional theory and magnetization dynamics calculations to gain deep insight into the substrate dependent relevant magnetization relaxation mechanisms. X-ray magnetic circular dichroism reveals the opening of a butterfly-shaped magnetic hysteresis of DyPc2 molecules on magnesium oxide and a closed loop on the bare silver substrate, while density functional theory shows that the molecules are only weakly adsorbed in both cases of magnesium oxide and silver. The enhanced magnetic stability of DyPc2 on the oxide film, in conjunction with previous experiments on the TbPc2 analogue, points to a general validity of the magnesium oxide induced stabilization effect. Magnetization dynamics calculations reveal that the enhanced magnetic stability of DyPc2 and TbPc2 on the oxide film is due to the suppression of two-phonon Raman relaxation processes. The results suggest that substrates with low phonon density of states are beneficial for the design of spintronics devices based on single-molecule magnets.

Original languageEnglish
Article number1901736
JournalAdvanced Science
Volume6
Issue number22
DOIs
StatePublished - 1 Nov 2019

Keywords

  • X-ray absorption spectroscopy
  • molecular spintronics
  • single-ion magnets
  • single-molecule magnets
  • surfaces

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