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Emerging two-dimensional ferromagnetism in silicene materials.

Andrey M Tokmachev1, Dmitry V Averyanov1, Oleg E Parfenov1

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Researchers discovered intrinsic two-dimensional (2D) in-plane ferromagnetism in rare-earth functionalized silicene layers. This breakthrough enables robust 2D magnets compatible with silicon technology for spintronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Intense research focuses on low-dimensional materials for ultra-compact spintronics.
  • Engineering two-dimensional (2D) magnetism has advanced via defects, edges, adatoms, and magnetic proximity.
  • Intrinsic 2D ferromagnetism was elusive until recent discoveries in Cr-based layers.

Purpose of the Study:

  • To explore intrinsic 2D ferromagnetism in rare-earth functionalized silicene.
  • To investigate the evolution of magnetic properties from bulk to monolayer silicene.
  • To assess the compatibility of these 2D magnets with silicon technology.

Main Methods:

  • A bottom-up approach was used to produce layered silicene structures.
  • Silicene was functionalized with rare-earth atoms.
  • Magnetic properties were studied across different layer thicknesses, from bulk to one monolayer.

Main Results:

  • Observed a transition from antiferromagnetism in bulk to intrinsic 2D in-plane ferromagnetism in ultrathin silicene layers.
  • Ferromagnetism exhibited characteristic dependence of transition temperature on low magnetic fields.
  • Emerging ferromagnetism was confirmed through electron transport measurements.

Conclusions:

  • Discovery of a new class of robust 2D magnets based on functionalized silicene.
  • These 2D magnets are compatible with mature silicon technology.
  • The findings are instrumental for engineering novel spintronic devices and advancing spin phenomena understanding.