Hysteresis shift in Fe-filled carbon nanotubes due to γ-Fe

C. Prados, P. Crespo, J. M. González, A. Hernando, J. F. Marco, R. Gancedo, N. Grobert, M. Terrones, R. M. Walton, and H. W. Kroto
Phys. Rev. B 65, 113405 – Published 15 February 2002
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Abstract

The phase distribution of high aspect ratio, Fe-filled carbon nanotubes prepared by pyrolyzing a mixture of powered ferrocene and C60 has been determined by means of Mössbauer spectroscopy. Our results for that characterization are closely related to the observation, after field cooling processes, of a hysteresis loop shift and clearly suggest a spatial phase distribution which includes the presence of a γ-Fe/α-Fe interface. The temperature dependence of the hysteresis loop shift is discussed in terms of localized regions at that interface exhibiting uncompensated antiferromagnetism within reduced dimensions.

  • Received 27 November 2001

DOI:https://doi.org/10.1103/PhysRevB.65.113405

©2002 American Physical Society

Authors & Affiliations

C. Prados1, P. Crespo1, J. M. González1,2, A. Hernando1, J. F. Marco3, R. Gancedo3, N. Grobert4, M. Terrones4, R. M. Walton4, and H. W. Kroto4

  • 1Instituto de Magnetismo Aplicado RENFE-UCM, P.O. Box 155, 28230 Las Rozas, Madrid
  • 2Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain
  • 3Instituto de Química-Física Rocasolano, CSIC, C/Serrano 119, 28006 Madrid, Spain
  • 4Fullerene Science Centre, School of Chemistry, Physics and Environmental Science, University of Sussex, Brighton BN1 9QJ, United Kingdom

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Vol. 65, Iss. 11 — 15 March 2002

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