Designer spin order in diradical nanographenes

Yuqiang Zheng, Can Li, Chengyang Xu, Doreen Beyer, Xinlei Yue, Yan Zhao, Guanyong Wang, Dandan Guan, Yaoyi Li, Hao Zheng, Canhua Liu, Junzhi Liu, Xiaoqun Wang, Weidong Luo, Xinliang Feng (), Shiyong Wang () and Jinfeng Jia ()
Additional contact information
Yuqiang Zheng: Shanghai Jiao Tong University
Can Li: Shanghai Jiao Tong University
Chengyang Xu: Shanghai Jiao Tong University
Doreen Beyer: Technische Universität Dresden
Xinlei Yue: Shanghai Jiao Tong University
Yan Zhao: Shanghai Jiao Tong University
Guanyong Wang: Shanghai Jiao Tong University
Dandan Guan: Shanghai Jiao Tong University
Yaoyi Li: Shanghai Jiao Tong University
Hao Zheng: Shanghai Jiao Tong University
Canhua Liu: Shanghai Jiao Tong University
Junzhi Liu: The University of Hong Kong
Xiaoqun Wang: Shanghai Jiao Tong University
Weidong Luo: Shanghai Jiao Tong University
Xinliang Feng: Technische Universität Dresden
Shiyong Wang: Shanghai Jiao Tong University
Jinfeng Jia: Shanghai Jiao Tong University

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract The magnetic properties of carbon materials are at present the focus of intense research effort in physics, chemistry and materials science due to their potential applications in spintronics and quantum computing. Although the presence of spins in open-shell nanographenes has recently been confirmed, the ability to control magnetic coupling sign has remained elusive but highly desirable. Here, we demonstrate an effective approach of engineering magnetic ground states in atomically precise open-shell bipartite/nonbipartite nanographenes using combined scanning probe techniques and mean-field Hubbard model calculations. The magnetic coupling sign between two spins was controlled via breaking bipartite lattice symmetry of nanographenes. In addition, the exchange-interaction strength between two spins has been widely tuned by finely tailoring their spin density overlap, realizing a large exchange-interaction strength of 42 meV. Our demonstrated method provides ample opportunities for designer above-room-temperature magnetic phases and functionalities in graphene nanomaterials.

Date: 2020
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DOI: 10.1038/s41467-020-19834-2

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