AI Article Synopsis
- Researchers are exploring how to make graphene magnetic to enhance its use in spintronics, a technology that relies on electron spin.
- The study reports successful observation and control of magnetic moments in graphene structures on a gold surface using scanning tunneling spectroscopy, finding localized electron spins around zigzag carbon sites.
- Results show that coupling between nearby spins creates a stable singlet state, while the addition of hydrogen atoms affects the magnetic properties of the nanostructure.
Article 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.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6331630 | PMC |
| http://dx.doi.org/10.1038/s41467-018-08060-6 | DOI Listing |
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