4th Edition of International Conference on

Materials Science and Engineering

March 13-15, 2023 | Online Event

Materials 2022

Chi Ho Wong

Speaker at Materials Science and Engineering 2022 -  Chi Ho Wong
The Hong Kong University of Science and Technology, Hong Kong

Title : Enormous enhancement of p orbital magnetism in the lightly doped carbon chains


We present a path to tailor adapted magnetic properties in carbon chains. Our undoped carbon chains show p-orbital ferromagnetism up to 400K experimentally. As the ferromagnetism of carbon chains depends on chain-to-chain distance, a tunable ferromagnetism may occur if the carbon chains are compressed. We also demonstrate that the charge fluctuation of the free radical electrons triggered by a time-varying electric dipole moment leads to enormous p-orbital magnetism of carbon chain. By introducing 25% arsenic and 12.5% fluorine into the monoatomic carbon chain, the magnetic moment of the arsenic atom reaches 2.9 μB, which is ∼1.3 times stronger than magnetic moment of bulk Fe and meanwhile its exchange–correlation energy reaches 22 meV (∼270 K). Besides, the closely-packed carbon chains further developed for magneto-electric applications is highly possible if the substrate plays a role as an actuator.

What will audience learn from your presentation?

The audience should be able to apply the relationship between p-orbital ferromagnetism and the dynamics of free-radical electrons to design nano-magnets of carbon. The p-orbital magnetism in carbon chains triggered by kink structures and free-radical electrons may be the origin of unusual magnetism in nano-graphene.

The results can be elaborated to study unusual magnetism in nano-graphene.



Dr. Roy WCH serves as Scholar in The Hong Kong University of Science and Technology. He has published international journals and patents in Materials Physics & Artificial Intelligence in addition to university textbooks about electric motors, turbocharged engines and FPGA programming. Apart from this, he has served as invited speaker in the international conferences on science. He works as journal reviewer for American Chemical Society, Elsevier and The Royal Society of Chemistry.