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Related Concept Videos

Dielectric Polarization in a Capacitor01:31

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
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When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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Colossal flexoresistance in dielectrics.

Sung Min Park1,2, Bo Wang3, Tula Paudel4

  • 1Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul, 08826, Korea.

Nature Communications
|May 24, 2020
PubMed
Summary
This summary is machine-generated.

Flexoelectricity allows dielectrics to switch between insulating and conducting states without damage. This colossal flexoresistance effect, observed in strontium titanate, opens new avenues for electrical switching applications.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Electrical Engineering

Background:

  • Dielectrics are typically unsuitable for electrical switches due to low conductivity or irreversible damage under strong fields.
  • Flexoelectricity, the generation of polarization from strain gradients, offers a potential route to overcome these limitations.

Purpose of the Study:

  • To investigate the potential of flexoelectricity in enabling damage-free electrical switching in dielectrics.
  • To demonstrate reversible switching between insulating and conducting states in ultrathin dielectric films.

Main Methods:

  • Applying strain gradients to ultrathin strontium titanate (SrTiO3) films using an atomic force microscope tip.
  • Utilizing flexoelectricity to generate non-destructive, strong electrostatic fields within the dielectric.
  • Measuring changes in resistivity under varying strain gradients.

Main Results:

  • Flexoelectricity enabled damage-free exposure of SrTiO3 to strong electric fields.
  • A colossal flexoresistance effect was observed, with resistivity decreasing by at least 10^8-fold.
  • Reversible switching between insulating and highly conducting states was achieved.

Conclusions:

  • Flexoelectricity provides a novel mechanism for electrical switching in dielectrics.
  • The colossal flexoresistance phenomenon in SrTiO3 is attributed to strain-gradient-induced tunneling conductance.
  • This research expands the possibilities for electrical control in solids and electromechanical field applications.