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Iron porphyrin molecules on Cu(001): Influence of adlayers and ligands on the magnetic properties
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2013 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 87, no 17, 174425- p.Article in journal (Refereed) Published
Abstract [en]

The structural and magnetic properties of Fe octaethylporphyrin molecules on Cu(001) have been investigated by means of density functional theory (DFT) methods and x-ray absorption spectroscopy. The molecules have been adsorbed on the bare metal surface and on an oxygen-covered surface, which shows a root 2 x 2 root 2R45 degrees reconstruction. In order to allow for a direct comparison between magnetic moments obtained from sum-rule analysis and DFT, we calculate the spin dipolar term 7T (theta), which is also important in view of the magnetic anisotropy of the molecule. The measured x-ray magnetic circular dichroism shows a strong dependence on the photon incidence angle, which we could relate to a huge value of 7T (theta), e. g., on Cu(001), 7T (theta) amounts to -2.07 mu(B) for normal incidence leading to a reduction of the effective spin moment (m(s) + 7T (theta)). Calculations have also been performed to study the influence of possible ligands such as Cl and O atoms on the magnetic properties of the molecule and the interaction between molecule and surface because the experimental spectra display a clear dependence on the ligand, which is used to stabilize the molecule in the gas phase. Both types of ligands weaken the hybridization between surface and porphyrin molecule and change the magnetic spin state of the molecule, but the changes in the x-ray absorption are clearly related to residual Cl ligands.

Place, publisher, year, edition, pages
2013. Vol. 87, no 17, 174425- p.
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-202914DOI: 10.1103/PhysRevB.87.174425ISI: 000319349500004OAI: oai:DiVA.org:uu-202914DiVA: diva2:634569
Available from: 2013-07-01 Created: 2013-07-01 Last updated: 2013-07-01Bibliographically approved

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Herper, Heike C.Sanyal, BiplabEriksson, Olle
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