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Quadrupolar XMCD at the Fe K-edge in Fe phthalocyanine film on Au: Insight into the magnetic ground state

Juan Bartolomé1, Fernando Bartolomé1, Adriana I. Figueroa1, Oana Bunău1, Ivan K. Schuller2, Thomas Gredig3, Fabrice Wilhelm4, Andrei Rogalev4, Peter Krüger5 et al.

Calogero R. Natoli1,6

  • 1Instituto de Ciencia de Materiales de Aragón, Departamento de Física de la Materia Condensada, CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
  • 2Department of Physics and Center for Advanced Nanotechnology, University of California at San Diego, La Jolla, California 92093, USA
  • 3Department of Physics and Astronomy, California State University at Long Beach, 1250 Bellower Boulevard, Long Beach, California 90840-9505, USA
  • 4ESRF-The European Synchrotron, 38043 Grenoble Cedex 9, France
  • 5Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi-cho, Inage, Chiba 263-8522, Japan
  • 6INFN Laboratori Nazionali di Frascati, Casella Postale 13, I-00044 Frascati, Italy

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Phys. Rev. B 91, 220401(R) – Published 2 June, 2015

DOI: https://doi.org/10.1103/PhysRevB.91.220401

Abstract

The observation of an anomalous quadrupolar signal in x-ray magnetic circular dichroism (XMCD) at the Fe K-edge of iron phthalocyanine (FePc) films is reported. All ground states previously suggested for FePc are incompatible with the experimental data. Based on ab initio molecular orbital multiplet calculations of the isolated FePc molecule, we propose a model for the magnetic ground state of the FePc film that explains the XMCD data and reproduces the observed values of the orbital moments in the perpendicular and planar directions.

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References (17)

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Phys. Rev. B 91, 220401(R)– Published 2 June, 2015
  • Received 11 February 2015
  • Revised 11 May 2015
Article part of CHORUS

©2015 American Physical Society

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