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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.4K
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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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Diamagnetism01:26

Diamagnetism

2.5K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Valence Bond Theory02:42

Valence Bond Theory

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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...
9.1K
Magnetic Moment of an Electron01:23

Magnetic Moment of an Electron

1.6K
Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...
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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Updated: Aug 23, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Enhancing Electron Correlation at a 3d Ferromagnetic Surface.

David Maximilian Janas1, Andrea Droghetti2, Stefano Ponzoni1

  • 1TU Dortmund University, Department of Physics, 44227, Dortmund, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|October 27, 2022
PubMed
Summary
This summary is machine-generated.

Adsorbate-induced electronic correlations drastically alter iron

Keywords:
Stoner modelelectron correlationmany-particle effectsspin filtering

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Area of Science:

  • Surface Science
  • Condensed Matter Physics
  • Materials Science

Background:

  • Understanding electronic structure at interfaces is crucial for spintronics and catalysis.
  • The Stoner model is a common but limited approach for ferromagnetism.
  • Many-electron effects at interfaces are often overlooked.

Purpose of the Study:

  • To investigate the spin-dependent electronic structure of the iron-oxygen interface.
  • To explore adsorbate-induced changes in electronic correlations.
  • To reveal many-electron behaviors beyond the one-electron approximation.

Main Methods:

  • Combining spin-resolved momentum microscopy with theoretical calculations.
  • Utilizing methods beyond the one-electron approximation.
  • Analyzing the spin-dependent electronic structure of Fe-O interfaces.

Main Results:

  • An adsorbate-induced enhancement of electronic correlations was observed.
  • Drastic narrowing of Fe d-bands and reduced exchange splitting near the Fermi energy were found.
  • Significant spin-dependent band broadening and merging with satellite features indicated many-electron behavior.

Conclusions:

  • Adsorbate adsorption can tune electronic correlated regimes in transition metals.
  • Many-particle effects are critical for understanding adsorbate-metal interfaces.
  • Existing theories for interfaces need revision to include many-electron phenomena for applications in spintronics and catalysis.