文献类型：期刊文献

英文题名：Ferromagnetism in hydrogenated N-doped amorphous carbon films

作者：Liu, S. Y.[1,2];Zhen, C. M.[2];Li, Y. Z.[2];Pan, C. F.[2];Zhou, H. J.[2];Hou, D. L.[2]

机构：[1]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China;[2]Hebei Normal Univ, Dept Phys, Hebei Adv Thin Films Lab, Shijiazhuang 050024, Peoples R China

年份：2012

卷号：111

期号：5

外文期刊名：JOURNAL OF APPLIED PHYSICS

收录：SCI-EXPANDED(收录号：WOS:000301729200090)、、EI(收录号：20121314910539)、Scopus(收录号：2-s2.0-84858952902)、WOS

基金：This work has been supported by the National Natural Science Foundation of China (Grant No. 10804026), Natural Science Foundation of Hebei Province (E2010000429), and Foundation of Hebei Educational Committee (Grant No. 2006123). The authors would like to thank Dr. L. Ma for her assistance in the PPMS experiments.

语种：英文

外文关键词：Amorphous carbon - Annealing - Doping (additives) - Ferromagnetism - Hydrogenation - Magnetic moments - Magnetization - Metal analysis - Plasma CVD - Plasma enhanced chemical vapor deposition - Spin polarization

外文摘要：Room temperature ferromagnetism has been observed in hydrogenated N-doped amorphous carbon films (a-CNx:H) prepared by plasma enhanced chemical vapor deposition. The magnetization of the films changed depending on the ratio (R) of the flow rate of nitrogen to that of methane during deposition and on the annealing temperature. The highest magnetization of the as-deposited samples was obtained with R = 4. Annealing the films at 300 degrees C resulted in a significant increase in the magnetic moment compared to that of the as-deposited films. When the annealing temperature was above 500 degrees C, the magnetic moment of the samples decreased. No ferromagnetic impurities could be detected. The ferromagnetism of the a-CNx:H film is attributed mainly to spin-polarization of the p orbitals of the N adatoms on the surface or in the interlayers of irregular carbon. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3692084]