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Adsorption-Induced Surface Magnetism.

Miloš Baljozović1, Shiladitya Karmakar2, André L Fernandes Cauduro3

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Summary
This summary is machine-generated.

Magnetism emerges in nonmagnetic materials when specific molecules adsorb onto a copper surface. This adsorption-induced magnetism is localized at the interface and offers new ways to engineer spin-polarized states.

Keywords:
Hubbard modelchemisorptionchirality-induced spin selectivityspin-polarized low-energy electron microscopy (SP-LEEM)surface magnetism

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Molecule-metal interfaces are crucial for spintronics.
  • Inducing magnetism in nonmagnetic materials is a significant challenge.
  • Heterohelicene molecules offer unique electronic properties.

Purpose of the Study:

  • Investigate the emergence of magnetism in heterohelicene/Cu(100) systems.
  • Determine the mechanism behind adsorption-induced magnetism.
  • Explore the potential for engineering spin-polarized states.

Main Methods:

  • Spin-polarized low-energy electron microscopy (SPLEEM) for spin-dependent reflectivity.
  • Control experiments on different substrates (clean Cu(100), graphite).
  • Spin-polarized density functional theory (SP-DFT) calculations.
  • Extended Newns-Anderson-Grimley model simulations.

Main Results:

  • SPLEEM revealed spin-dependent electron reflectivity for enantiopure 7,12,17-trioxa[11]helicene (TO[11]H) monolayers on Cu(100).
  • Magnetism was localized in the topmost copper layer, not originating from the molecule itself or chirality.
  • SP-DFT and theoretical models attributed magnetism to strong chemisorption, hybridization, and Coulomb correlation.

Conclusions:

  • Chemisorption of TO[11]H on Cu(100) induces a spin-polarized state at the interface.
  • This study demonstrates a novel mechanism for creating magnetism in molecule-metal systems.
  • Findings provide pathways for designing organic-inorganic hybrid materials with tailored spin properties.