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Substantial Magnetic Fields Arising from Ballistic Ring Currents in Single-Molecule Junctions.

William Bro-Jørgensen1,2, Stephan P A Sauer1, Gemma C Solomon1,2,3

  • 1Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark.

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Summary

Researchers calculated magnetic fields from single-molecule junctions. They found specific molecular structures and conditions, like high current and small ring diameter, are key for generating substantial, experimentally relevant magnetic fields.

Keywords:
Biot−Savart lawcurrent densitymagnetismmolecular electronicsring currentsingle-molecule electromagnetismsingle-molecule junction

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Area of Science:

  • Molecular electronics
  • Quantum chemistry
  • Spintronics

Background:

  • Electric bias applied to single-molecule junctions causes current flow via tunneling.
  • Molecules with cyclic or helical structures can exhibit circular currents, generating magnetic fields.

Purpose of the Study:

  • To calculate the magnetic field generated by ballistic current density in single-molecule junctions.
  • To identify molecular structures and conditions conducive to substantial current-induced magnetic fields.

Main Methods:

  • Implementation of the Biot-Savart law.
  • Calculation of magnetic fields from current density in selected cyclic and linear molecules.
  • Analysis of factors influencing magnetic field strength, including current, ring unidirectionality, and diameter.

Main Results:

  • Three prerequisites for substantial magnetic fields: high current, unidirectional ring current within the bias window, and small ring diameter.
  • Cyclic annulenes with bond-length alternation can produce mT-range magnetic fields.
  • Linear carbon chains with helical π-systems also yield mT-range fields, potentially reaching sub-tesla levels closer to resonance.

Conclusions:

  • Proof-of-concept for generating experimentally relevant current-induced magnetic fields in molecular wires at low bias.
  • Identified specific cyclic and linear molecules as promising candidates for generating significant magnetic fields.