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Low-Temperature Magnetotransport and Magnetic Properties of Cobalt-Doped Amorphous Carbon Thin Films
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Low-Temperature Magnetotransport and Magnetic Properties of Cobalt-Doped Amorphous Carbon Thin Films
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National Natural Science Foundation of China (51041010); The Ph.D. Programs Foundation of Ministry of Education of China (20090002110007) and the National Basic Research Program of China (2010CB934602)

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    摘要:

    采用磁控共濺射方法在n型Si(100)基片上制備了一系列具有不同Co含量 (x，at%) 的Co摻雜非晶C顆粒薄膜，濺射溫度為室溫。研究了Co-C顆粒薄膜的微結(jié)構(gòu)，磁輸運(yùn)特性及磁性能。通過(guò)優(yōu)化Co含量，在低溫下發(fā)現(xiàn)了較大的負(fù)磁電阻 (MR)。溫度為2 K、磁場(chǎng)為90×79.6 kA·m-1時(shí)，Co含量為6.4 at%的Co-C薄膜的負(fù)磁電阻值最大，達(dá)到27.6%。隨著Co含量從6.4 at%增加至16.4 at%，MR值從27.6%逐漸減小至2.2%。電阻率r 隨溫度T的變化曲線(xiàn)顯示了線(xiàn)性的lnr-T–1/2關(guān)系，說(shuō)明樣品中電子傳導(dǎo)遵循隧穿輸運(yùn)機(jī)制。

    Abstract:

    A series of Co-doped amorphous carbon granular thin films with various Co contents (x, at%) were deposited on n-type Si (100) substrates by a magnetron co-sputtering technique at room temperature. The microstructure, magnetotransport and magnetic properties of the Co-C films have been characterized. By optimizing Co content, giant negative magnetoresistances (MRs) were observed at low temperature, with a maximum MR ratio of 27.6% at 2 K under an applied magnetic field of 90×79.6 kA·m-1 for the film with Co content of 6.4 at%. As Co content increases from 6.4 at% to 16.4 at%, the MR ratio decreases gradually from 27.6% to 2.2%. A linear lnr-T–1/2 relationship indicates that the spin transport in Co6.4C93.6 thin film agrees well with tunneling conductance.

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唐瑞鶴,劉 偉,張政軍,于榮海,劉曉芳,楊 白,水口將輝,高梨弘毅. Low-Temperature Magnetotransport and Magnetic Properties of Cobalt-Doped Amorphous Carbon Thin Films[J].稀有金屬材料與工程,2012,41(11):1887~1890.[Tang Ruihe, Liu Wei, Zhang Zhengjun, Yu Ronghai, Liu Xiaofang, Yang Bai, Mizuguchi Masaki, Takanashi Koki. Low-Temperature Magnetotransport and Magnetic Properties of Cobalt-Doped Amorphous Carbon Thin Films[J]. Rare Metal Materials and Engineering,2012,41(11):1887~1890.]
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  • 收稿日期:2011-11-20
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