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Circular dichroism and angular deviation in x-ray absorption spectra of Dy2ScN@C80 single-molecule magnets on h−BN/Rh(111)


Greber, T; Seitsonen, A P; Hemmi, A; Dreiser, J; Stania, R; Matsui, F; Muntwiler, M; Popov, A A; Westerström, R (2019). Circular dichroism and angular deviation in x-ray absorption spectra of Dy2ScN@C80 single-molecule magnets on h−BN/Rh(111). Physical Review Materials, 3(1):014409.

Abstract

Endohedral fullerenes, such as Dy2ScN@C80, are single-molecule magnets with long relaxation times of their magnetization. An open and anisotropic 4f electron shell in the lanthanides (here Dy) imposes a magnetic moment that maintains its orientation at liquid-helium temperatures for macroscopic times. If these molecules shall be used as single-bit information storage elements or for quantum operations, the orientation of the endohedral units and the orientation of the magnetic moments has to be controlled. X-ray absorption spectroscopy (XAS) and magnetic circular dichroism (XMCD)—with variation of the angle of x-ray incidence—allows for the detection of these two structural elements. We present XMCD data of Dy2ScN@C80 on an h−BN/Rh(111) nanomesh that display at 2 K a large hysteresis with a coercive field of 0.4 T. The angular dependence of the XAS data at the Dy M5 edge indicates partial ordering of the endohedral units. In order to quantify anisotropic orientation we introduce the “deviation” D as an operational quantity that measures differences between two spectra.

Abstract

Endohedral fullerenes, such as Dy2ScN@C80, are single-molecule magnets with long relaxation times of their magnetization. An open and anisotropic 4f electron shell in the lanthanides (here Dy) imposes a magnetic moment that maintains its orientation at liquid-helium temperatures for macroscopic times. If these molecules shall be used as single-bit information storage elements or for quantum operations, the orientation of the endohedral units and the orientation of the magnetic moments has to be controlled. X-ray absorption spectroscopy (XAS) and magnetic circular dichroism (XMCD)—with variation of the angle of x-ray incidence—allows for the detection of these two structural elements. We present XMCD data of Dy2ScN@C80 on an h−BN/Rh(111) nanomesh that display at 2 K a large hysteresis with a coercive field of 0.4 T. The angular dependence of the XAS data at the Dy M5 edge indicates partial ordering of the endohedral units. In order to quantify anisotropic orientation we introduce the “deviation” D as an operational quantity that measures differences between two spectra.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:16 January 2019
Deposited On:02 May 2019 10:50
Last Modified:03 May 2019 07:36
Publisher:American Physical Society
ISSN:2475-9953
OA Status:Green
Publisher DOI:https://doi.org/10.1103/physrevmaterials.3.014409
Project Information:
  • : FunderSNSF
  • : Grant ID200021-100005
  • : Project TitleNeural network statistical estimation for very broad coverage parsing
  • : FunderSNSF
  • : Grant ID200021_129861
  • : Project TitleResonant X-ray Photoelectron Diffraction (RXPD) of magnetic molecules
  • : FunderSNSF
  • : Grant ID200021_147143
  • : Project TitleTetrathiafulvalene and Benzodifuran-based Molecular Scaffoldings: Design and Synthesis of Large pi-conjugated Electro-Active Molecules for Organic (Opto)electronics
  • : FunderH2020
  • : Grant ID648295
  • : Project TitleGraM3 - Surface-grafted metallofullerene molecular magnets with controllable alignment of magnetic moments

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