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Videos de Conceptos Relacionados

Ferromagnetism01:31

Ferromagnetism

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...
Dielectric Polarization in a Capacitor01:31

Dielectric 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...
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic 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.
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Fermi Level Dynamics01:12

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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Published on: August 15, 2018

Dinámica del dominio durante la conmutación ferroeléctrica.

Christopher T Nelson1, Peng Gao, Jacob R Jokisaari

  • 1Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA.

Science (New York, N.Y.)
|November 19, 2011
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores observaron la dinámica de conmutación ferroeléctrica en una bicapa de bismuto ferrita y lantano estroncio manganita. Se encontraron defectos e interfaces que impedían la conmutación ferroeléctrica completa en la película delgada.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Física de la materia condensada Física de la materia condensada
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • Los materiales ferroeléctricos permiten el cambio de polarización a través de campos eléctricos, crucial para las aplicaciones.
  • La comprensión de los mecanismos de conmutación de polarización a nanoescala requiere una caracterización estructural avanzada.

Objetivo del estudio:

  • Investigar la cinética y la dinámica de la conmutación ferroeléctrica a nanoescala.
  • Para dilucidar el papel de las interfaces y defectos en el comportamiento de conmutación ferroeléctrica.

Principales métodos:

  • Utilizó microscopía electrónica de transmisión corregida por aberración para imágenes de alta resolución.
  • Logró milisegundos de resolución temporal y subangstrom espacial para observar eventos de conmutación dinámica.

Principales resultados:

  • Se observaron eventos de nucleación localizados en la interfaz del electrodo.
  • Documentado dominio de pared de fijación en puntos de defectos dentro del material.
  • Formación de dominio ferroeléctrico identificado localizado en la interfaz ferroeléctrica/ferromagnética.

Conclusiones:

  • Los defectos e interfaces impiden significativamente la conmutación ferroeléctrica completa en películas delgadas.
  • El estudio proporciona información sobre la dinámica del dominio a nanoescala en heterosestructuras complejas.