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Phys. Rev. B 66, 024429 (2002) [10 pages]

Ferromagnetism in oriented graphite samples

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P. Esquinazi*, A. Setzer, R. Höhne, and C. Semmelhack
Department of Superconductivity and Magnetism, Institute for Experimental Physics II, University of Leipzig, Linnéstr. 5, D-04103 Leipzig, Germany

Y. Kopelevich
Instituto de Física, Universidade Estadual de Campinas, Unicamp 13083-970, Campinas, São Paulo, Brazil

D. Spemann and T. Butz
Department of Nuclear Solid State Physics, Institute for Experimental Physics II, University of Leipzig, Linnéstrasse 5, D-04103 Leipzig, Germany

B. Kohlstrunk and M. Lösche
Physics of Biomembranes, Institute for Experimental Physics I, University of Leipzig, Linnéstrasse 5, D-04103 Leipzig, Germany

Received 21 December 2001; revised 27 February 2002; published 19 July 2002

We have studied the magnetization of various well characterized samples of highly oriented pyrolitic graphite (HOPG), Kish graphite, and natural graphite to investigate the recently reported ferromagneticlike signal and its possible relation to ferromagnetic impurities. The magnetization results obtained for HOPG samples for applied fields parallel to the graphene layers—to minimize the diamagnetic background—show no correlation with the magnetic impurity concentration. Our overall results suggest an intrinsic origin for the ferromagnetism found in graphite. We discuss possible origins of the ferromagnetic signal.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.66.024429
DOI:
10.1103/PhysRevB.66.024429
PACS:
75.50.Pp

*Email: esquin@physik. uni-leipzig. de

 
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