Exchange bias in graphitic C/Co composites
URI (for links/citations):http://www.sciencedirect.com/science/article/pii/S0008622316311368
Hsu H. -S.
Chang Y. -Y
Chin Y. -Y
Lin H. -J.
Chen Ch. -T.
Sun Sh. -J.
Zharkov, S. M.
Lin Ch. -R.
Ovchinnikov, S. G.
Институт инженерной физики и радиоэлектроники
Кафедра теоретической физики и волновых явлений
Journal Quartile in Scopus:Q1
Journal Quartile in Web of Science:Q1
Bibliographic Citation:Hsu H. -S. Exchange bias in graphitic C/Co composites [Текст] / Hsu H. -S., Chang Y. -Y, Chin Y. -Y, Lin H. -J., Chen Ch. -T., Sun Sh. -J., S. M. Zharkov, Lin Ch. -R., S. G. Ovchinnikov // Carbon. — 2017. — Т. 114. — С. 642-648
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.