期刊
CARBON
卷 114, 期 -, 页码 642-648出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2016.12.060
关键词
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资金
- Ministry of Science and Technology of the Republic of China, Taiwan [MOST 104-2112-M-153 -002 -MY3, MOST 103-2112-M-213-004-MY3, MOST 104-2112-M-390-001]
- President of Russia Program of the leading scientific schools [NSh-7559,2016.2]
The exchange bias (EB) effect, which is the shift of the hysteresis loop of a ferromagnet in direct contact with an antiferromagnet, is highly advantageous for the development of spintronics applications. Carbon (C) has been considered as a potential material in next generation electronics production as well as spintronics devices beyond silicon. Here we show experimental evidence for an EB in C/Co composites. The significant EB needs thermal annealing to occur. X-ray absorption spectra and transmission electron microscopy data of these samples reveal that Co carbides in as grown samples decompose and form graphitic C/Co interfaces after annealing. Using x-ray magnetic circular dichroism we have detected the C spins that are responsible for the EB. These results inspire a theoretical model to investigate the magnetic interactions in graphitic C/Co interfaces and interpret the observed results. (C) 2016 Elsevier Ltd. All rights reserved.
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