STM image of a graphene nanoribbon in which a seven-carbon-atom armchair configuration doped by a pair of boron atoms builds up a net magnetic moment.

From the article:

Magnetism of Topological Boundary States Induced by Boron Substitution in Graphene Nanoribbons
Niklas Friedrich, Pedro Brandimarte, Jingcheng Li, Shohei Saito, Shigehiro Yamaguchi, Iago Pozo, Diego Peña, Thomas Frederiksen, Aran Garcia-Lekue, Daniel Sánchez-Portal, and José Ignacio Pascual
Phys. Rev. Lett. 125, 146801 (2020)

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