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Near-Perfect Spin Filtering and Negative Differential Resistance in an Fe(II)S Complex.

Sherif Abdulkader Tawfik1, Leigh Weston2, X Y Cui3

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|May 2, 2017
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Area of Science:

  • Quantum Chemistry
  • Materials Science
  • Condensed Matter Physics

Background:

  • Single molecular magnets (SMMs) are crucial for developing advanced electronic devices.
  • Understanding spin-polarized transport in SMMs is key to spintronics.

Purpose of the Study:

  • To investigate spin-resolved transport properties of an iron(II)sulfur single molecular magnet.
  • To explore the potential of this molecule in nanoelectronic and nanospintronic applications.

Main Methods:

  • Density functional theory (DFT) calculations.
  • Nonequilibrium Green's function (NEGF) formalism.
  • Analysis of spin-resolved electronic transport.

Main Results:

  • The iron(II)sulfur molecule exhibits near-perfect spin filtering with efficiency exceeding 99%.
  • Significant negative differential resistance (NDR) was observed at low bias voltages.
  • Spin-up conductivity changes are linked to shifts between molecular orbitals and the Fe atom's magnetic moment.

Conclusions:

  • The molecule demonstrates exceptional spin-filtering and NDR properties.
  • The low-bias NDR onset makes it promising for nanoelectronic and nanospintronic applications.
  • This research highlights the potential of molecular materials in next-generation electronics.