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Proximity ferroelectricity in wurtzite heterostructures.

Chloe H Skidmore1, R Jackson Spurling1, John Hayden1

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Proximity ferroelectricity was observed in wurtzite heterostructures, enabling polarization reversal in non-ferroelectric materials. This interface phenomenon occurs without chemical disorder, opening new avenues for ferroelectric applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Proximity ferroelectricity is an interface phenomenon where adjacent ferroelectric materials induce polarization reversal in non-ferroelectric materials.
  • Wurtzite materials offer a unique platform for exploring interface-driven phenomena due to their distinct crystal structure.

Purpose of the Study:

  • To demonstrate and investigate proximity ferroelectricity in wurtzite ferroelectric heterostructures.
  • To elucidate the underlying physical mechanism of polarization reversal at interfaces in these materials.

Main Methods:

  • Fabrication of nitride-nitride, oxide-oxide, and nitride-oxide heterostructures with wurtzite materials.
  • Multimodal characterization including polarization hysteresis, piezo response force microscopy, and scanning transmission electron microscopy.
  • Density functional theory calculations to model switching barriers and domain wall energies.

Main Results:

  • Proximity ferroelectricity was successfully induced in non-ferroelectric AlN and ZnO layers by adjacent ferroelectric Al(B)N, Al(Sc)N, and Zn(Mg)O layers.
  • A physical switching model was proposed, involving antipolar nuclei propagation and interface field effects reducing the switching barrier.
  • Experimental validation confirmed ferroelectric switching in both layers across various heterostructure configurations.

Conclusions:

  • Proximity ferroelectricity can be achieved in wurtzite heterostructures without relying on elemental substitution.
  • This work expands the understanding of interface-based ferroelectricity and its potential for novel electronic devices.