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題名: Microstructure and Magnetic Properties of Co-C Nanogranular Films
作者: Lee, Y. H.;Huang, Y. S.;Min, J. F.;Wu, K. M.;Horng, Lance
貢獻者: 物理學系
關鍵詞: Cobalt;Nanogranular film;Magnetic recording media;Magnetic property;Microstructure
日期: 2007-03
上傳時間: 2013-02-05T02:19:34Z
出版者: Elsevier
摘要: 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 Ta⩾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 Ta for 30 mTorr. The largest Hc=381 Oe is obtained at Ta=600 °C. Different microstructures and magnetic properties of the films made at the high and low pressures are compared and discussed.
關聯: J. Magn. Magn. Mater., 310(2): e913-e915
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