Abstract:
:Turning graphene magnetic is a promising challenge to make it an active material for spintronics. Predictions state that graphene structures with specific shapes can spontaneously develop magnetism driven by Coulomb repulsion of π-electrons, but its experimental verification is demanding. Here, we report on the observation and manipulation of individual magnetic moments in graphene open-shell nanostructures on a gold surface. Using scanning tunneling spectroscopy, we detect the presence of single electron spins localized around certain zigzag sites of the carbon backbone via the Kondo effect. We find near-by spins coupled into a singlet ground state and quantify their exchange interaction via singlet-triplet inelastic electron excitations. Theoretical simulations picture how electron correlations result in spin-polarized radical states with the experimentally observed spatial distributions. Extra hydrogen atoms bound to radical sites quench their magnetic moment and switch the spin of the nanostructure in half-integer amounts. Our work demonstrates the intrinsic π-paramagnetism of graphene nanostructures.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Li J,Sanz S,Corso M,Choi DJ,Peña D,Frederiksen T,Pascual JIdoi
10.1038/s41467-018-08060-6subject
Has Abstractpub_date
2019-01-14 00:00:00pages
200issue
1issn
2041-1723pii
10.1038/s41467-018-08060-6journal_volume
10pub_type
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