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, Xixiang Zhang, R. W.M. Kwok

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)4919-4921
Number of pages3
JournalJournal of Applied Physics
Volume88
Issue number8
DOIs
StatePublished - Oct 15 2000

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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