TY - JOUR
T1 - Understanding the Superior Stability of Single-Molecule Magnets on an Oxide Film
AU - Studniarek, Michał
AU - Wäckerlin, Christian
AU - Singha, Aparajita
AU - Baltic, Romana
AU - Diller, Katharina
AU - Donati, Fabio
AU - Rusponi, Stefano
AU - Brune, Harald
AU - Lan, Yanhua
AU - Klyatskaya, Svetlana
AU - Ruben, Mario
AU - Seitsonen, Ari Paavo
AU - Dreiser, Jan
N1 - Funding Information:
This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 701647. M.S. and J.D. gratefully acknowledge funding by the Swiss National Science Foundation (Grant No. 200021_165774/1). K.D. acknowledges support from the ‘EPFL Fellows' fellowship programme co-funded by Marie Curie, FP7 Grant agreement no. 291771. The authors thank Stefan Zeugin for technical assistance during the measurements. A.P.S. acknowledges super-computing resources at the Centro Svizzero di Calcolo Scientifico (CSCS), Lugano (TI), under the project uzh11. A.S. and F.D. acknowledge support from the Institute of Basic Science, Korea, through the project IBS-R027-D1.
Publisher Copyright:
© 2019 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/11/1
Y1 - 2019/11/1
N2 - 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.
AB - 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.
KW - X-ray absorption spectroscopy
KW - molecular spintronics
KW - single-ion magnets
KW - single-molecule magnets
KW - surfaces
UR - http://www.scopus.com/inward/record.url?scp=85073922661&partnerID=8YFLogxK
U2 - 10.1002/advs.201901736
DO - 10.1002/advs.201901736
M3 - Article
AN - SCOPUS:85073922661
SN - 2198-3844
VL - 6
JO - Advanced Science
JF - Advanced Science
IS - 22
M1 - 1901736
ER -