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Related Concept Videos

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...
Valence Bond Theory02:42

Valence 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...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
Biasing of Metal-Semiconductor Junctions01:27

Biasing 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...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...

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Magnetoelectric coupling effects in multiferroic complex oxide composite structures.

Carlos A F Vaz1, Jason Hoffman, Charles H Ahn

  • 1Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA. carlos.vaz@cantab.net

Advanced Materials (Deerfield Beach, Fla.)
|April 24, 2010
PubMed
Summary
This summary is machine-generated.

Magnetoelectric materials are gaining attention for next-gen electronics. This report highlights recent advances in complex oxide multiferroic composites and their magnetoelectric coupling effects.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Renewed interest in magnetoelectric materials driven by advances in complex material synthesis.
  • The search for novel materials with functionalities for next-generation electronic devices.
  • Focus on multiferroic composite materials for enhanced magnetoelectric properties.

Purpose of the Study:

  • To provide an overview of recent developments in magnetoelectric materials.
  • To emphasize magnetoelectric coupling effects in complex oxide multiferroic composites.
  • To explore potential applications in future electronic devices.

Main Methods:

  • Review of recent scientific literature and experimental findings.
  • Analysis of controlled growth techniques for complex oxide materials.
  • Characterization of magnetoelectric coupling phenomena in multiferroic composites.

Main Results:

  • Significant progress in understanding and controlling magnetoelectric coupling.
  • Identification of promising complex oxide multiferroic composites.
  • Demonstration of functionalities relevant to next-generation electronics.

Conclusions:

  • Complex oxide multiferroic composites are key to advancing magnetoelectric applications.
  • Continued research is essential for harnessing the full potential of these materials.
  • Magnetoelectric materials offer a promising pathway for future electronic innovations.