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Designing a mechanically driven spin-crossover molecular switch via organic embedding.

Sumanta Bhandary1, Jan M Tomczak2, Angelo Valli3

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Researchers designed a mechanical spin-switch using iron-porphyrin (FeP) embedded in graphene nanoribbons. Applying tensile strain switches FeP between low-spin and high-spin states, toggling device current by over tenfold.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Spin-crossover (SCO) complexes, particularly iron-porphyrin (FeP), are promising for molecular spintronics due to their tunable spin states.
  • FeP's planar structure and balanced electronic interactions offer potential for device integration, but reliable mechanical control remains a challenge.

Purpose of the Study:

  • To theoretically design a novel mechanical spin-switch device utilizing FeP.
  • To demonstrate the feasibility of using external tensile strain to control the spin state of FeP within a purely organic device architecture.

Main Methods:

  • Combined density functional theory (DFT) with many-body techniques to model the spin-state transition.
  • Employed graphene nanoribbon electrodes for mechanical strain application and current transport measurements.
  • Investigated the interplay between Coulomb interaction and ligand field effects under strain.

Main Results:

  • Demonstrated that experimentally feasible tensile strain can induce a spin-crossover from low-spin (S=1) to high-spin (S=2) in FeP.
  • Observed a significant toggle in device current (over an order of magnitude) concomitant with the spin-state transition.
  • Showcased a fully planar mechanical current-switch unit integrated with molecular spintronics.

Conclusions:

  • The proposed FeP-based mechanical spin-switch offers a reliable and reproducible method for spin control in molecular spintronics.
  • Graphene nanoribbons provide a compatible and stretchable platform for such organic spintronic devices.
  • This work introduces a new paradigm for mechanical current switching at the molecular level.