Spin and orbital configuration of metal phthalocyanine chains assembled on the Au(110) surface

Pierluigi Gargiani, Giorgio Rossi, Roberto Biagi, Valdis Corradini, Maddalena Pedio, Sara Fortuna, Arrigo Calzolari, Stefano Fabris, Julio Criginski Cezar, N. B. Brookes, and Maria Grazia Betti
Phys. Rev. B 87, 165407 – Published 4 April 2013
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Abstract

The spin and orbital configuration of magnetic metal phthalocyanines (MPcs) deposited on metallic substrates are strongly influenced by the rehybridization of the molecular states with the underlying metal. FePc, CoPc, and CuPc isolated molecules are archetypal systems to investigate the interrelationship between magnetic moments and orbital symmetry after deposition on a metallic substrate. MPcs form long-range ordered chains self-assembled along the reconstructed channels of the Au(110) surface. X-ray magnetic circular dichroism from the L2,3 absorption edges of Fe, Co, and Cu shows that the orbital and spin configuration are strongly modified upon adsorption on the Au(110) surface if the orbitals responsible of the magnetic moment are involved in the interaction process. The magnetic moment for a single layer of molecular chains is completely quenched for the CoPc molecules, fully preserved for the CuPc and reduced for the FePc ones. The modified magnetic configuration is confined to the very interface layer, i.e., to the MPc molecules bound to the metal substrate up to the compact packing of the single layer. The different response can be rationalized in terms of the symmetry/orientation of the metal-ion d states interacting with the substrate states, as indicated by density functional theory calculations in agreement with experimental findings.

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  • Received 23 October 2012

DOI:https://doi.org/10.1103/PhysRevB.87.165407

©2013 American Physical Society

Authors & Affiliations

Pierluigi Gargiani1,*, Giorgio Rossi2,3, Roberto Biagi4,5, Valdis Corradini5, Maddalena Pedio3, Sara Fortuna6, Arrigo Calzolari5, Stefano Fabris6, Julio Criginski Cezar7, N. B. Brookes7, and Maria Grazia Betti1

  • 1Dipartimento di Fisica, Università di Roma “La Sapienza,” Piazzale Aldo Moro 5, I-00185 Roma, Italy
  • 2Dipartimento di Fisica dell’Università di Milano, via Celoria 16, 20133 Milano, Italy
  • 3CNR-IOM TASC, S.S. 14, km 163.5, I-34149 Trieste, Italy
  • 4Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Università di Modena e Reggio Emilia, via Giuseppe Campi 213/A, I-41125 Modena, Italy
  • 5S3, Istituto Nanoscienze - CNR, I-41125 Modena, Italy
  • 6CNR-IOM DEMOCRITOS, Theory@Elettra Group, S.S. 14, km 163.5, I-34149 Trieste, Italy
  • 7European Synchrotron Radiation Facility-ESRF, BP 220, 38043 Grenoble CEDEX 9, France

  • *pierluigi.gargiani@roma1.infn.it

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Issue

Vol. 87, Iss. 16 — 15 April 2013

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