Degree of chemical reaction of carbon and oxygen to ferromagnetic grains for Co-based alloy-oxide granular structure |
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| Authors: | Shingo Sasaki Shin Saito Migaku Takahashi |
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| Institution: | 1. Ichinoseki National College of Technology, Takanashi, Hagisho, Ichinoseki, Iwate 021-8511, Japan;2. Department of Electronics Engineering, Graduate School of Engineering, Tohoku University, 6-6-05, Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan;3. New Industry Creation Hatchery Center, Tohoku University, 6-6-10, Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan |
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| Abstract: | The saturation magnetization factor, Ms, was investigated for a Co-based alloy-oxide granular film through the quantitative analysis of film composition and phase formation. Using a carbon cap layer deposited directly onto the Co-SiO2 film, both oxidation and carbonization of cobalt caused a reduction in Ms. The composition of the granular film strongly affects Ms, because the Ar gas pressure and discharge power during Co-SiO2 sputtering alters the Co and oxygen content in the film. In particular, for a film fabricated under a high Ar gas pressure such as 8.0 Pa, Ms was significantly decreased, due to the formation of the antiferromagnetic CoO phase. |
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| Keywords: | 75 50 Ss 75 70 Ak 81 15 Cd |
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