Nanosized graphene crystallite induced strong magnetism in pure carbon films
Nanosized graphene crystallite induced strong magnetism in pure carbon films
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纳米石墨烯微晶在纯碳膜中诱导强磁性
DOI：
10.1039/c4nr06711h
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发表时间：
2015-01-01
期刊：
影响因子：
6.7
通讯作者：
Diao, Dongfeng
中科院分区：
文献类型：
--
作者：
Wang, Chao;Zhang, Xi;Diao, Dongfeng
我们报道了在电子回旋共振等离子体中用电子辐照辅助物理气相沉积法生长的纯碳薄膜的强磁性。研究了石墨烯纳米晶在非晶薄膜基体中的形成过程，以及非晶、纳米晶和类石墨结构对磁性的影响。结果表明，非晶结构具有弱顺磁性，石墨烯纳米晶具有强磁化强度，类石墨结构具有较低的磁化强度。在300 K的室温下，在纳米尺寸的石墨烯纳米微晶结构中发现最高的饱和磁化强度为0.37 emu g（-1）。纳米石墨中强磁性的起源归因于石墨烯层边缘处的自旋磁矩。
We report strong magnetism in pure carbon films grown by electron irradiation assisted physical vapor deposition in electron cyclotron resonance plasma. The development of graphene nanocrystallites in the amorphous film matrix, and the dependence of the magnetic behavior on amorphous, nanocrystallite and graphite-like structures were investigated. Results were that the amorphous structure shows weak paramagnetism, graphene nanocrystallites lead to strong magnetization, and graphite-like structures corresponded with a lower magnetization. At a room temperature of 300 K, the highest saturation magnetization of 0.37 emu g(-1) was found in the nanosized graphene nanocrystallite structure. The origin of strong magnetism in nanocrystallites was ascribed to the spin magnetic moment at the graphene layer edges.