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Beating the Stoner criterion using molecular interfaces.

Fatma Al Ma'Mari1, Timothy Moorsom1, Gilberto Teobaldi2

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Researchers induced room-temperature ferromagnetism in non-magnetic metals like copper and manganese. This was achieved by creating interfaces with C60 molecular layers, potentially enabling new magnetic metamaterials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Ferromagnetism typically requires specific transition metals (Fe, Co, Ni) due to the Stoner criterion.
  • Non-ferromagnetic elements like Mn and Cu do not meet this criterion under normal conditions.

Purpose of the Study:

  • To investigate the possibility of inducing room-temperature ferromagnetism in non-ferromagnetic materials.
  • To explore the role of metal-molecule interfaces in altering magnetic properties.

Main Methods:

  • Fabrication of metallic thin films interfaced with C60 molecular layers.
  • Magnetometry for measuring induced magnetization.
  • Low-energy muon spin spectroscopy (LEMS) for probing magnetic states.
  • Density functional theory (DFT) simulations for mechanistic insights.

Main Results:

  • Room-temperature ferromagnetism was successfully induced in copper and manganese films at metal-C60 interfaces.
  • The ferromagnetic state was localized near the interface, diminishing with increased metal film thickness.
  • LEMS confirmed localized spin-ordered states at the interface.
  • DFT suggested electron transfer causing magnetic hardening of metal atoms.

Conclusions:

  • Metal-molecule interfaces can overcome the Stoner criterion to induce ferromagnetism in non-magnetic materials.
  • This phenomenon offers a pathway to design novel magnetic metamaterials using abundant, non-toxic components.
  • Control of charge transfer at interfaces can be leveraged for advanced electronic and computing devices.