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

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

Research output: Contribution to journalArticle

68 Citations (Scopus)

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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Cobalt
Quenching
Magnetic properties
cobalt
Carbon
arc discharges
magnetic properties
carbon
SQUIDs
Crucibles
Magnetometers
Hysteresis loops
graphite
quenching
Partial pressure
Cathodes
Gases
Flow rate
crucibles

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

Cite this

Varying the size and magnetic properties of carbon-encapsulated cobalt particles. / Bonard, Jean Marc; Seraphin, Supapan; Wegrowe, Jean Eric; Jiao, Jun; Châtelain, André.

In: Chemical Physics Letters, Vol. 343, No. 3-4, 03.08.2001, p. 251-257.

Research output: Contribution to journalArticle

Bonard, Jean Marc ; Seraphin, Supapan ; Wegrowe, Jean Eric ; Jiao, Jun ; Châtelain, André. / Varying the size and magnetic properties of carbon-encapsulated cobalt particles. In: Chemical Physics Letters. 2001 ; Vol. 343, No. 3-4. pp. 251-257.
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