Related Experiment Video
Updated: Jun 8, 2026
09:41
Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
Published on: May 29, 2018
Flux closure vortexlike domain structures in ferroelectric thin films.
1Nanoscience Centre, University of Cambridge, 11 JJ Thomson Avenue, Cambridge, CB3-0FF, United Kingdeom. yachinivry@gmail.com
Physical Review Letters
|September 28, 2010
Summary
Researchers studied nanoscale ferroelastic domains in lead zirconium titanate (PZT) films. They induced vortexlike structures using electric fields, revealing new configurations and size-dependent stability.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Ferroelastic domains in thin films are crucial for device applications.
- Understanding the nucleation and stability of ferroelastic domain structures is essential.
- Previous studies suggested physical edges are necessary for domain nucleation.
Purpose of the Study:
- To investigate nanoscale flux closure vortexlike structures of 90° ferroelastic domains in lead zirconium titanate (PZT) films.
- To explore the role of external electric fields in inducing these domain structures.
- To determine the factors influencing the stability of ferroelastic vortexlike structures.
Main Methods:
- Utilized enhanced piezoresponse force microscopy (PFM) for high-resolution nanoscale imaging.
- Applied external electric fields to induce and manipulate ferroelastic domain configurations.
- Analyzed the morphology and stability of induced vortexlike structures.
Main Results:
- Successfully induced flux closure vortexlike structures of 90° ferroelastic domains in PZT films.
- Demonstrated that nucleation can occur away from grain boundaries, challenging previous assumptions.
- Observed two distinct configurations of vortexlike structures, including a previously unreported one.
- Found that the stability of these vortexlike structures is dependent on their size.
Conclusions:
- Physical edges are not prerequisites for the nucleation of ferroelastic vortexlike structures.
- New configurations of ferroelastic vortexlike structures can be induced and observed.
- The size of the ferroelastic domain structures significantly impacts their stability.
- These findings contribute to a deeper understanding of ferroelasticity in thin films and support existing theoretical predictions.
Related Concept Videos
01:27Electrostatic Boundary Conditions in Dielectrics
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
01:31Dielectric Polarization in a Capacitor
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...
01:31Ferromagnetism
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...
01:24Metal-Semiconductor Junctions
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
02:42Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
01:27Biasing of Metal-Semiconductor Junctions
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...