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Magnetic Coupling and Single-Ion Anisotropy in Surface-Supported Mn-Based Metal–Organic Networks

DOI: 10.1021/jp502209q DOI Help

Authors: L. Giovanelli (Aix-Marseille Université) , A. Savoyant (Aix-Marseille Université) , M. Abel (Aix-Marseille Université) , Francesco Maccherozzi (Diamond Light Source) , Younal Ksari (Institut Materiaux Microelectronique de Provence (IM2NP)) , M. Koudia (Aix-Marseille Université) , R. Hayn (Aix-Marseille Université) , F. Choueikani (Synchrotron SOLEIL) , E. Otero (Synchrotron SOLEIL) , P. Ohresser (Synchrotron SOLEIL) , J M Themlin (Aix-Marseille Universite) , Sarnjeet Dhesi (Diamond Light Source) , S. Clair (Aix-Marseille Universite)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Physical Chemistry C , VOL 118 (22) , PAGES 11738 - 11744

State: Published (Approved)
Published: June 2014

Open Access Open Access

Abstract: The electronic and magnetic properties of Mn coordinated to 1,2,4,5-tetracyanobenzene (TCNB) in Mn–TCNB two-dimensional metal–ligand networks have been investigated by combining scanning tunneling microscopy and X-ray magnetic circular dichroism (XMCD) performed at low temperature (3 K). When formed on Au(111) and Ag(111) substrates, the Mn–TCNB networks display similar geometric structures. Magnetization curves reveal ferromagnetic coupling of the Mn sites with similar single-ion anisotropy energies but different coupling constants. Low-temperature XMCD spectra show that the local environment of the Mn centers differs appreciably for the two substrates. Multiplet structure calculations were used to derive the corresponding ligand field parameters, confirming an in-plane uniaxial anisotropy. The observed interatomic coupling is discussed in terms of superexchange as well as substrate-mediated magnetic interactions.

Subject Areas: Physics

Facility: Soleil

Added On: 26/01/2015 16:13

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