Wei Hu1, Chao Wang2, Hao Tan1, Hengli Duan1, Guinan Li1, Na Li1, Qianqian Ji1, Ying Lu1, Yao Wang1, Zhihu Sun3, Fengchun Hu1, Wensheng Yan4. 1. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China. 2. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China. chaowng@ustc.edu.cn. 3. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China. zhsun@ustc.edu.cn. 4. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, P. R. China. ywsh2000@ustc.edu.cn.
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.
Graphene is extremely promising for next-generation spintronics applications; however, realizing n class="Chemical">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.
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