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Antiferromagnetic coupling of Cr-porphyrin to a bare Co substrate
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2014 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 90, no 22, 220404- p.Article in journal (Refereed) Published
Abstract [en]

We report the discovery of an antiferromagnetic coupling of the magnetic moment of chromium(II) tetraphenylporphyrin (CrTPP) molecules to the magnetization of the clean ferromagnetic Co(001) substrate. We assign this unusual molecule-substrate exchange coupling to the less than half-filled chromium 3d orbitals interacting with Co valence band electrons via porphyrin-ligand molecular orbitals. X-ray magnetic circular dichroism, x-ray photoelectron spectroscopy, and scanning tunneling microscopy are combined with DFT + U calculations and provide evidence for a surprising type of antiferromagnetic 90 degrees indirect magnetic exchange coupling.

Place, publisher, year, edition, pages
2014. Vol. 90, no 22, 220404- p.
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Physical Sciences
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URN: urn:nbn:se:uu:diva-240204DOI: 10.1103/PhysRevB.90.220404ISI: 000346093000001OAI: oai:DiVA.org:uu-240204DiVA: diva2:776505
Available from: 2015-01-07 Created: 2015-01-06 Last updated: 2017-12-05Bibliographically approved

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Tarafder, KartickOppeneer, Peter M.

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