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Spin state in perfluorinated FePc films on Cu(111) and Ag(111) in dependence on film thickness

Spin state in perfluorinated FePc films on Cu(111) and Ag(111) in dependence on film thickness
Spin state in perfluorinated FePc films on Cu(111) and Ag(111) in dependence on film thickness

The electronic structure of the central iron ion of perfluorinated iron phthalocyanine (FePcF16) in thin films has been studied on Cu(111) and Ag(111) using polarization dependent X-ray absorption spectroscopy (XAS). The data are compared to FePc on Ag(111). Ligand field parameters have been computed, and multiplet calculations (CTM4XAS) were carried out to simulate XAS spectra. The planar molecules are preferentially oriented lying flat on the substrate surface during the growth of the 1-4 nm thick films. A clear polarization dependence of the Fe L edge absorption spectra is observed, arising from transitions into orbitals with in-plane and out-of-plane character. The shape of the spectra for three to four monolayers of FePcF16 on Cu(111) is comparable to that of the thin films of FePc on Ag(111). However, a drastic change of the XAS peak shape is observed for thicker FePcF16 films on both Ag(111) and Cu(111), although the molecular orientation is very similar to coverages consisting of a few monolayers. Since in both cases the film thickness is distinctly beyond the monolayer regime, interface interactions can be ruled out as a possible origin of this behavior. Rather, the different XAS peak shapes seem to indicate that the multiplicity may depend on the detailed arrangement of the FePcF16 molecules. The large flexibility of the ground state of Fe could be of high interest for spintronic applications.

1932-7447
15390-15394
Belser, Axel
84dd6697-d2a3-4a72-a4bd-5f8c5991692f
Karstens, Reimer
a5a1ccc7-bc45-4b00-b3a3-59bfcc6ade8d
Grüninger, Peter
ef62d075-4a95-4ae7-b736-94d07577e517
Nagel, Peter
5b0fe2be-074c-4cab-ac98-6515e99f7f3d
Merz, Michael
175ee16e-86bf-4e55-94d9-60a6c26d6fd1
Schuppler, Stefan
1a234af8-e7b6-49ba-bfaa-26ab45fc89c6
Suturina, Elizaveta A.
24dd007d-949a-4852-99d1-ea42b00103ef
Chassé, Angelika
bf572838-37ec-4bb8-95c3-656c7157a516
Chassé, Thomas
e4433cd9-4892-474e-a773-ac74dca7c007
Peisert, Heiko
63951bfb-892a-4297-a50c-963e4c3dcc8a
Belser, Axel
84dd6697-d2a3-4a72-a4bd-5f8c5991692f
Karstens, Reimer
a5a1ccc7-bc45-4b00-b3a3-59bfcc6ade8d
Grüninger, Peter
ef62d075-4a95-4ae7-b736-94d07577e517
Nagel, Peter
5b0fe2be-074c-4cab-ac98-6515e99f7f3d
Merz, Michael
175ee16e-86bf-4e55-94d9-60a6c26d6fd1
Schuppler, Stefan
1a234af8-e7b6-49ba-bfaa-26ab45fc89c6
Suturina, Elizaveta A.
24dd007d-949a-4852-99d1-ea42b00103ef
Chassé, Angelika
bf572838-37ec-4bb8-95c3-656c7157a516
Chassé, Thomas
e4433cd9-4892-474e-a773-ac74dca7c007
Peisert, Heiko
63951bfb-892a-4297-a50c-963e4c3dcc8a

Belser, Axel, Karstens, Reimer, Grüninger, Peter, Nagel, Peter, Merz, Michael, Schuppler, Stefan, Suturina, Elizaveta A., Chassé, Angelika, Chassé, Thomas and Peisert, Heiko (2018) Spin state in perfluorinated FePc films on Cu(111) and Ag(111) in dependence on film thickness. The Journal of Physical Chemistry C, 122 (27), 15390-15394. (doi:10.1021/acs.jpcc.8b03436).

Record type: Article

Abstract

The electronic structure of the central iron ion of perfluorinated iron phthalocyanine (FePcF16) in thin films has been studied on Cu(111) and Ag(111) using polarization dependent X-ray absorption spectroscopy (XAS). The data are compared to FePc on Ag(111). Ligand field parameters have been computed, and multiplet calculations (CTM4XAS) were carried out to simulate XAS spectra. The planar molecules are preferentially oriented lying flat on the substrate surface during the growth of the 1-4 nm thick films. A clear polarization dependence of the Fe L edge absorption spectra is observed, arising from transitions into orbitals with in-plane and out-of-plane character. The shape of the spectra for three to four monolayers of FePcF16 on Cu(111) is comparable to that of the thin films of FePc on Ag(111). However, a drastic change of the XAS peak shape is observed for thicker FePcF16 films on both Ag(111) and Cu(111), although the molecular orientation is very similar to coverages consisting of a few monolayers. Since in both cases the film thickness is distinctly beyond the monolayer regime, interface interactions can be ruled out as a possible origin of this behavior. Rather, the different XAS peak shapes seem to indicate that the multiplicity may depend on the detailed arrangement of the FePcF16 molecules. The large flexibility of the ground state of Fe could be of high interest for spintronic applications.

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e-pub ahead of print date: 8 June 2018
Published date: 12 July 2018

Identifiers

Local EPrints ID: 425326
URI: https://eprints.soton.ac.uk/id/eprint/425326
ISSN: 1932-7447
PURE UUID: 55e77f6b-f52c-47c8-8824-35e198ca0e65

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Date deposited: 12 Oct 2018 16:30
Last modified: 12 Oct 2018 16:30

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Contributors

Author: Axel Belser
Author: Reimer Karstens
Author: Peter Grüninger
Author: Peter Nagel
Author: Michael Merz
Author: Stefan Schuppler
Author: Elizaveta A. Suturina
Author: Angelika Chassé
Author: Thomas Chassé
Author: Heiko Peisert

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