Understanding the Superior Stability of Single-Molecule Magnets on an Oxide Film
- 주제(키워드) molecular spintronics , single-ion magnets , single-molecule magnets , surfaces , X-ray absorption spectroscopy
- 등재 SCIE, SCOPUS
- OA유형 Green Published, gold
- 발행기관 John Wiley and Sons Inc.
- 발행년도 2019
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000162427
- 본문언어 영어
- Published As http://dx.doi.org/10.1002/advs.201901736
- PubMed https://pubmed.ncbi.nlm.nih.gov/31763154
- 저작권 이화여자대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
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. © 2019 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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