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

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

doi:10.1016/S0009-2614(01)00716-3

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 journal › Article › peer-review

70 Scopus citations

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 language	English (US)
Pages (from-to)	251-257
Number of pages	7
Journal	Chemical Physics Letters
Volume	343
Issue number	3-4
DOIs	https://doi.org/10.1016/S0009-2614(01)00716-3
State	Published - Aug 3 2001
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1016/S0009-2614(01)00716-3

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@article{5fc2b6945c654ed886828c757cc6bfe8,

title = "Varying the size and magnetic properties of carbon-encapsulated cobalt particles",

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.",

author = "Bonard, {Jean Marc} and Supapan Seraphin and Wegrowe, {Jean Eric} and Jun Jiao and Andr{\'e} Ch{\^a}telain",

note = "Funding Information: The authors wish to thank Yvan Jaccard and Jean-Philippe Ansermet (IPE-EPFL) for discussions and help with the magnetic measurements, the Centre Interd{\'e}partemental de Microscopie Electronique (CIME-EPFL) for access to the electron microscopes, as well as Claude Blanc, Michel Fazan and Andr{\'e} Guisolan (IPE-EPFL) for appreciated technical support. The financial support of the Swiss National Science Foundation, of EPFL and of the US National Science Foundation (Grant DMR9302353) is gratefully acknowledged.",

year = "2001",

month = aug,

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doi = "10.1016/S0009-2614(01)00716-3",

language = "English (US)",

volume = "343",

pages = "251--257",

journal = "Chemical Physics Letters",

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TY - JOUR

T1 - Varying the size and magnetic properties of carbon-encapsulated cobalt particles

AU - Bonard, Jean Marc

AU - Seraphin, Supapan

AU - Wegrowe, Jean Eric

AU - Jiao, Jun

AU - Châtelain, André

N1 - Funding Information: The authors wish to thank Yvan Jaccard and Jean-Philippe Ansermet (IPE-EPFL) for discussions and help with the magnetic measurements, the Centre Interdépartemental de Microscopie Electronique (CIME-EPFL) for access to the electron microscopes, as well as Claude Blanc, Michel Fazan and André Guisolan (IPE-EPFL) for appreciated technical support. The financial support of the Swiss National Science Foundation, of EPFL and of the US National Science Foundation (Grant DMR9302353) is gratefully acknowledged.

PY - 2001/8/3

Y1 - 2001/8/3

N2 - 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.

AB - 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.

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U2 - 10.1016/S0009-2614(01)00716-3

DO - 10.1016/S0009-2614(01)00716-3

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VL - 343

SP - 251

EP - 257

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 3-4

ER -

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

Abstract

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