Embedding atomic cobalt into graphene lattices to activate room-temperature ferromagnetism

Wei Hu, Chao Wang (), Hao Tan, Hengli Duan, Guinan Li, Na Li, Qianqian Ji, Ying Lu, Yao Wang, Zhihu Sun (), Fengchun Hu and Wensheng Yan ()
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Wei Hu: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Chao Wang: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Hao Tan: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Hengli Duan: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Guinan Li: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Na Li: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Qianqian Ji: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Ying Lu: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Yao Wang: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Zhihu Sun: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Fengchun Hu: National Synchrotron Radiation Laboratory, University of Science and Technology of China
Wensheng Yan: National Synchrotron Radiation Laboratory, University of Science and Technology of China

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Graphene is extremely promising for next-generation spintronics applications; however, realizing graphene-based room-temperature magnets remains a great challenge. Here, we demonstrate that robust room-temperature ferromagnetism with TC up to ∼400 K and saturation magnetization of 0.11 emu g−1 (300 K) can be achieved in graphene by embedding isolated Co atoms with the aid of coordinated N atoms. Extensive structural characterizations show that square-planar Co-N4 moieties were formed in the graphene lattices, where atomically dispersed Co atoms provide local magnetic moments. Detailed electronic structure calculations reveal that the hybridization between the d electrons of Co atoms and delocalized pz electrons of N/C atoms enhances the conduction-electron mediated long-range magnetic coupling. This work provides an effective means to induce room-temperature ferromagnetism in graphene and may open possibilities for developing graphene-based spintronics devices.

Date: 2021
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DOI: 10.1038/s41467-021-22122-2

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