Microstructure and magnetic properties of Co-C nanogranular films

Y. H. Lee; Y. S. Huang; J. F. Min; G. M. Wu; L. Horng

doi:10.1016/j.jmmm.2006.10.947

Microstructure and magnetic properties of Co-C nanogranular films

Y. H. Lee, Y. S. Huang, J. F. Min, G. M. Wu, L. Horng

Department of Physics

Research output: Contribution to journal › Article

9 Citations (Scopus)

Abstract

Nanogranular films of Co-C were fabricated by DC magnetron sputtering at high (30 mTorr) and low (5 mTorr) pressures with Co concentration controlled at about 40 at%. The granular morphology of the as-deposited film remains unchanged, and is altered, respectively, for 30 and 5 mTorr upon annealing. At annealing temperature T_a≥500 °C, the phase is changed from hexagonal closed-pack (HCP) Co to faulted HCP Co plus FCC Co for 30 mTorr, and to Co₂C for 5 mTorr. Both the grain size and the coercivity increase with increase in T_a for 30 mTorr. The largest H_c=381 Oe is obtained at T_a=600 °C. Different microstructures and magnetic properties of the films made at the high and low pressures are compared and discussed.

Original language	English
Pages (from-to)	e913-e915
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 3
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.947
Publication status	Published - 2007 Mar 1

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All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

Lee, Y. H., Huang, Y. S., Min, J. F., Wu, G. M., & Horng, L. (2007). Microstructure and magnetic properties of Co-C nanogranular films. Journal of Magnetism and Magnetic Materials, 310(2 SUPPL. PART 3), e913-e915. https://doi.org/10.1016/j.jmmm.2006.10.947

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10.1016/j.jmmm.2006.10.947