PhD Mid-term Seminar Series: Engineering π-magnetism in carbon-based nanostructures
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PhD Mid-term Seminar Series: Engineering π-magnetism in carbon-based nanostructures
CIC nanoGUNE Seminars
- Speaker
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Alessio Vegliante, Pre-doctoral Researcher, Nanoimaging
- When
-
2022/09/19
13:00
- Place
- nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
- Add to calendar
-
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**Engineering π-magnetism in carbon-based nanostructures**
Alessio Vegliante
Pre-doctoral Researcher, Nanoimaging
Magnetic carbon-based materials and nanostructures have recently emerged as
potential building blocks for spintronics and quantum computation. They
offer, in fact, several advantages compared to transition metals, since their
low spin-orbit coupling and hyperfine interaction result in longer spin
coherence times, more delocalized magnetic moments and long-range spin
interactions.
While magnetism is missing among the properties of ideal graphene, an
intrinsic spin polarization can develop in some graphene nanostructures with
well-defined shapes exhibiting an open-shell character, i.e., possessing one
or more unpaired π-electrons. The high reactivity of these systems makes
their synthesis and characterization particularly challenging. Recently,
however, the advances of on-surface synthesis performed on metal substrates in
ultra-high vacuum environments have allowed to fabricate open-shell carbon
nanostructures with atomic precision. At the same time, the growth on metal
substrates has the advantage of enabling the characterization of these
nanostructures by means of surface science techniques, like scanning tunneling
microscopy and spectroscopy.
Here we will show our results on the characterization of magnetic interactions
in different spin-hosting carbon nanostructures with progressively higher
number of unpaired π-electrons. Firstly, we will report our investigation of
the intramolecular spin coupling in individual organic radicals on metal
substrates. Then, we will present a more complex system, a cyclic structure
exhibiting fingerprints of collective spin states. Finally, we will briefly
describe our ongoing attempts at growing more extended networks with the aim
of exploring the emergence of carbon magnetism in two-dimensional systems.