期刊
CARBON
卷 47, 期 5, 页码 1399-1406出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2009.01.032
关键词
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资金
- National Natural Science Foundation of China [10705047, 10675075, 50402017]
- Knowledge Innovation Program of Chinese Academy of Sciences [KJCX3-SYW-N10]
- National Basic Research Program of China [2005CB623602]
Vacancies and vacancy clusters produced by carbon ion implantation in highly oriented pyrolytic graphite, and their annealing behavior associated with the ferromagnetism of the implanted sample are studied using positron annihilation in conjunction with ferromagnetic moment measurements using a superconducting quantum interferometer device magnetometer. The results indicate that the magnetic moments are closely correlated to the existence of the vacancy defects in the samples and this is supported by theoretical calculations using density functional theory. The mechanism of magnetic order in the implanted sample is discussed. (C) 2009 Elsevier Ltd. All rights reserved.
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