Varying the size and magnetic properties of carbon-encapsulated cobalt particles

Jean Marc Bonard, Supapan Seraphin, Jean Eric Wegrowe, Jun Jiao, André Châtelain

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Abstract

Carbon-encapsulated cobalt particles were produced by a modified arc-discharge technique and subsequently purified with an acid treatment. The arc discharge was realized between a graphite cathode and a graphite crucible with a solid Co target, under partial He pressure with an additional quenching jet. The produced particles are spherical and covered by typically 3-5 graphitic carbon shells. The mean diameter could be varied between 5 and 45 nm by changing the deposition parameters (gas pressure and flow rate of the quenching jet). The magnetic properties were analyzed with a variable temperature SQUID magnetometer. The encapsulated particles showed ferromagnetic hysteresis loops with marked size-dependent properties.

Original languageEnglish (US)
Pages (from-to)251-257
Number of pages7
JournalChemical Physics Letters
Volume343
Issue number3-4
DOIs
StatePublished - Aug 3 2001

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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