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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Enhanced Piezoelectric Response at Nanoscale Vortex Structures in Ferroelectrics.

Xiaowen Shi1, Nimish Prashant Nazirkar1, Ravi Kashikar2

  • 1Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States.

ACS Applied Materials & Interfaces
|January 30, 2024
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Topological vortices significantly enhance piezoelectric response in nanoscale materials. These vortices, found where ferroelectric phases meet, offer a new design pathway for advanced piezoelectric applications.

Keywords:
Bragg coherent X-ray diffraction imagingmolecular dynamicsnanocrystalphase coexistencepiezoelectric responsetopological ferroelectric vortex structure

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • The piezoelectric response quantifies a material's sensitivity to mechanical stress or electric fields.
  • Understanding nanoscale piezoelectric behavior is crucial for advanced electronic devices.

Purpose of the Study:

  • To investigate the source of enhanced piezoelectric response at the nanoscale.
  • To explore the role of topological vortices in piezoelectricity.

Main Methods:

  • Utilized in operando X-ray Bragg coherent diffraction imaging.
  • Employed first-principles-based molecular dynamics simulations.

Main Results:

  • Observed a 5-fold enhancement in piezoelectric response near topological vortex cores.
  • Identified vortices as regions of coalescing low-symmetry ferroelectric phases and phase boundaries.
  • Found largest nanoscale piezoelectric responses in regions of minimal spontaneous polarization at vortex cores.

Conclusions:

  • Topological vortices are key to achieving high piezoelectric responses in pure BaTiO3 at the nanoscale.
  • Nanoscale piezoelectric materials can be designed by controlling vortex core parameters.
  • Findings impact the development of next-generation piezoelectric materials for various applications.