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An electrically controlled single-molecule spin switch.

Wantong Huang1, Kwan Ho Au-Yeung1,2, Paul Greule1

  • 1Physikalisches Institut, Karlsruhe Institute of Technology, Karlsruhe, Germany.

Nature Communications
|September 8, 2025
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Summary
This summary is machine-generated.

Researchers developed an electrically controlled single-molecule spin switch using iron phthalocyanine (FePc) on magnesium oxide. This switch enables tunable control over spin states, crucial for advancing scalable quantum technologies.

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Area of Science:

  • Quantum technology
  • Materials science
  • Molecular magnetism

Background:

  • Precise control of spin states is essential for quantum technologies.
  • Molecular spin systems offer tunable and scalable architectures.
  • Switchable qubit-qubit interactions are needed for quantum devices.

Purpose of the Study:

  • To present an electrically controlled single-molecule spin switch.
  • To demonstrate reversible switching between magnetic and non-magnetic states.
  • To show the application of the switch in modifying spin properties.

Main Methods:

  • Fabrication of a bistable complex (Fe adatom coupled to FePc) on a magnesium oxide film.
  • Electrical switching using scanning tunneling microscope (STM) tip and bias voltage pulses.
  • Characterization via inelastic electron tunneling spectroscopy (IETS) and density functional theory (DFT) calculations.

Main Results:

  • Reversible switching between paramagnetic and non-magnetic spin configurations was achieved.
  • Distinct changes in spin states were confirmed by IETS and DFT.
  • The molecular spin switch successfully modified the electron spin resonance frequency of a nearby FePc spin.

Conclusions:

  • Individual molecular machines can function as addressable spin switches.
  • This technology enables the creation of scalable and tunable quantum devices.
  • The study highlights a pathway for building complex molecular quantum circuits.