Shell/core structure and magnetic properties of carbon-coated Fe-Co(C) nanocapsules

Z. D. Zhang, J. G. Zheng, I. Skorvanek, G. H. Wen, J. Kovac, F. W. Wang, J. L. Yu, Z. J. Li, X. L. Dong, S. R. Jin, W. Liu, Xixiang Zhang

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

Shell-core structures of Fe(C), Co(C) and Fe-Co(C) nanocapsules, prepared by an arc discharge process in a mixture of methane and helium, have been demonstrated by means of high-resolution transmission electron microscopy (HRTEM). These nanoscale magnetic cores are protected by graphite shells. It has been found that the zero-field-cooled (ZFC) magnetization of Fe-Co(C) nanocapsules that display different characteristics in three temperature ranges can be well interpreted in terms of the unblocking of magnetization of small single-domain particles and the depinning of large multidomain particles. The saturation magnetization of these nanocapsules decreases monotonically, while the coercivity decreases significantly with increasing temperature.

Original languageEnglish (US)
Pages (from-to)1921-1929
Number of pages9
JournalJournal of Physics Condensed Matter
Volume13
Issue number9
DOIs
StatePublished - Mar 5 2001

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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