Magnetic properties and structure evolution of amorphous Co-C nanocomposite films prepared by pulsed filtered vacuum arc deposition

H. Wang; S. P. Wong; W. Y. Cheung; N. Ke; G. H. Wen; X. X. Zhang; R. W.M. Kwok

doi:10.1063/1.1312831

Magnetic properties and structure evolution of amorphous Co-C nanocomposite films prepared by pulsed filtered vacuum arc deposition

H. Wang, S. P. Wong^*, W. Y. Cheung, N. Ke, G. H. Wen, X. X. Zhang, R. W.M. Kwok

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

45 Scopus citations

Abstract

The magnetic properties and structure evolution of Co_xC_1-x (x=44, 65, 71 at. %) nanocomposite films prepared by pulsed filtered vacuum arc deposition were studied. The as-deposited films consist of amorphous Co clusters in a-C and are soft ferromagnets. The low coercivity in the amorphous films is due to the very low anisotropy of the amorphous Co clusters. After annealing in vacuum at 350°C for 1 h, the Co clusters crystallize and these films become magnetically harder. The magnetic hardening is attributed to the enhanced magnetic anisotropy of the nanocrystals. Their saturation magnetization reduces slightly. This is attributed to the reduction of the density of states at the Fermi level caused by the crystallization of the amorphous Co clusters.

Original language	English (US)
Pages (from-to)	4919-4921
Number of pages	3
Journal	Journal of Applied Physics
Volume	88
Issue number	8
DOIs	https://doi.org/10.1063/1.1312831
State	Published - Oct 2000
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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title = "Magnetic properties and structure evolution of amorphous Co-C nanocomposite films prepared by pulsed filtered vacuum arc deposition",

abstract = "The magnetic properties and structure evolution of CoxC1-x (x=44, 65, 71 at. %) nanocomposite films prepared by pulsed filtered vacuum arc deposition were studied. The as-deposited films consist of amorphous Co clusters in a-C and are soft ferromagnets. The low coercivity in the amorphous films is due to the very low anisotropy of the amorphous Co clusters. After annealing in vacuum at 350°C for 1 h, the Co clusters crystallize and these films become magnetically harder. The magnetic hardening is attributed to the enhanced magnetic anisotropy of the nanocrystals. Their saturation magnetization reduces slightly. This is attributed to the reduction of the density of states at the Fermi level caused by the crystallization of the amorphous Co clusters.",

author = "H. Wang and Wong, {S. P.} and Cheung, {W. Y.} and N. Ke and Wen, {G. H.} and Zhang, {X. X.} and Kwok, {R. W.M.}",

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T1 - Magnetic properties and structure evolution of amorphous Co-C nanocomposite films prepared by pulsed filtered vacuum arc deposition

AU - Wang, H.

AU - Wong, S. P.

AU - Cheung, W. Y.

AU - Ke, N.

AU - Wen, G. H.

AU - Zhang, X. X.

AU - Kwok, R. W.M.

PY - 2000/10

Y1 - 2000/10

N2 - The magnetic properties and structure evolution of CoxC1-x (x=44, 65, 71 at. %) nanocomposite films prepared by pulsed filtered vacuum arc deposition were studied. The as-deposited films consist of amorphous Co clusters in a-C and are soft ferromagnets. The low coercivity in the amorphous films is due to the very low anisotropy of the amorphous Co clusters. After annealing in vacuum at 350°C for 1 h, the Co clusters crystallize and these films become magnetically harder. The magnetic hardening is attributed to the enhanced magnetic anisotropy of the nanocrystals. Their saturation magnetization reduces slightly. This is attributed to the reduction of the density of states at the Fermi level caused by the crystallization of the amorphous Co clusters.

AB - The magnetic properties and structure evolution of CoxC1-x (x=44, 65, 71 at. %) nanocomposite films prepared by pulsed filtered vacuum arc deposition were studied. The as-deposited films consist of amorphous Co clusters in a-C and are soft ferromagnets. The low coercivity in the amorphous films is due to the very low anisotropy of the amorphous Co clusters. After annealing in vacuum at 350°C for 1 h, the Co clusters crystallize and these films become magnetically harder. The magnetic hardening is attributed to the enhanced magnetic anisotropy of the nanocrystals. Their saturation magnetization reduces slightly. This is attributed to the reduction of the density of states at the Fermi level caused by the crystallization of the amorphous Co clusters.

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DO - 10.1063/1.1312831

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JO - Journal of Applied Physics

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Magnetic properties and structure evolution of amorphous Co-C nanocomposite films prepared by pulsed filtered vacuum arc deposition

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