π-Electron Ferromagnetism in Metal-Free Carbon Probed by Soft X-Ray Dichroism

H. Ohldag, T. Tyliszczak, R. Höhne, D. Spemann, P. Esquinazi, M. Ungureanu, and T. Butz
Phys. Rev. Lett. 98, 187204 – Published 3 May 2007

Abstract

Elemental carbon represents a fundamental building block of matter and the possibility of ferromagnetic order in carbon has attracted widespread attention. However, the origin of magnetic order in such a light element is only poorly understood and has puzzled researchers. We present a spectromicroscopy study at room temperature of proton irradiated metal-free carbon using the elemental and chemical specificity of x-ray magnetic circular dichroism. We demonstrate that the magnetic order in the investigated system originates only from the carbon π-electron system.

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  • Received 6 September 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.187204

©2007 American Physical Society

Authors & Affiliations

H. Ohldag1,*, T. Tyliszczak2, R. Höhne3, D. Spemann3, P. Esquinazi3, M. Ungureanu3, and T. Butz3

  • 1Stanford Synchrotron Radiation Laboratory, Stanford University, P.O. Box 20450, Menlo Park, California 94025, USA
  • 2Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 3Institut für Experimentelle Physik II, Universität Leipzig, Linnéstraße 5, D-04103 Leipzig, Germany

  • *Electronic address: hohldag@stanford.edu

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Vol. 98, Iss. 18 — 4 May 2007

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