Emergent magnetism at transition-metal-nanocarbon interfaces

Proceedings of the National Academy of Sciences of the United States of America
Fatma Al Ma'MariOscar Cespedes

Abstract

Charge transfer at metallo-molecular interfaces may be used to design multifunctional hybrids with an emergent magnetization that may offer an eco-friendly and tunable alternative to conventional magnets and devices. Here, we investigate the origin of the magnetism arising at these interfaces by using different techniques to probe 3d and 5d metal films such as Sc, Mn, Cu, and Pt in contact with fullerenes and rf-sputtered carbon layers. These systems exhibit small anisotropy and coercivity together with a high Curie point. Low-energy muon spin spectroscopy in Cu and Sc-C60 multilayers show a quick spin depolarization and oscillations attributed to nonuniform local magnetic fields close to the metallo-carbon interface. The hybridization state of the carbon layers plays a crucial role, and we observe an increased magnetization as sp3 orbitals are annealed into sp2-π graphitic states in sputtered carbon/copper multilayers. X-ray magnetic circular dichroism (XMCD) measurements at the carbon K edge of C60 layers in contact with Sc films show spin polarization in the lowest unoccupied molecular orbital (LUMO) and higher π*-molecular levels, whereas the dichroism in the σ*-resonances is small or nonexistent. These results support the ...Continue Reading

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Citations

Jul 26, 2019·Nanotechnology·Srijani MallikSubhankar Bedanta
Mar 29, 2020·Science Advances·T MoorsomO Cespedes
Jan 21, 2021·ACS Applied Materials & Interfaces·Satam AlotibiOscar Cespedes
Mar 11, 2021·Physical Chemistry Chemical Physics : PCCP·Purbasha SharangiSubhankar Bedanta
Sep 10, 2019·ACS Applied Materials & Interfaces·Hebatalla ElnaggarFrank M F de Groot
Nov 21, 2017·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Lorena Martín-OliveraGilberto Teobaldi
Mar 8, 2018·The Journal of Physical Chemistry Letters·Sebastian RohlfKai Rossnagel

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