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Related Concept Videos

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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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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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...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
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Unit Cells01:18

Unit Cells

54
A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
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Related Experiment Video

Updated: Mar 22, 2026

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Multidomain Skyrmion Lattice State in Cu2OSeO3.

S L Zhang1, A Bauer2, D M Burn3

  • 1Clarendon Laboratory, Department of Physics, University of Oxford , Parks Road, Oxford OX1 3PU, United Kingdom.

Nano Letters
|April 13, 2016
PubMed
Summary

Researchers controlled magnetic skyrmion states on material surfaces using specific magnetic fields. This breakthrough enables precise manipulation of skyrmions for future spintronics applications.

Keywords:
magnetoelectricmultidomain stateresonant elastic X-ray scatteringskyrmion

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Magnetic skyrmions are nanoscale, topologically protected magnetization swirls.
  • They are promising for spintronics memory applications.
  • Controlling skyrmions at the material surface is crucial for device integration.

Purpose of the Study:

  • To demonstrate a controlled method for creating multidomain skyrmion states near the surface of Cu2OSeO3 single crystals.
  • To investigate the manipulation of skyrmion lattice structures using external magnetic fields.

Main Methods:

  • Soft resonant elastic X-ray scattering (Resonant Elastic X-ray Scattering - REXS) was employed to observe the magnetic states.
  • REXS provides depth sensitivity of approximately 50 nm, ideal for surface studies.
  • Magnetic fields were applied in directions deviating from the cubic axes of the crystal.

Main Results:

  • A controlled multidomain skyrmion state was successfully created near the surface.
  • The single-domain, 6-fold-symmetric skyrmion lattice was broken into domains.
  • Applying magnetic fields off the major cubic axes overcame inherent cubic anisotropy.

Conclusions:

  • This study presents a novel method for engineering skyrmion states locally on material surfaces.
  • The findings pave the way for manipulating individual skyrmions and developing advanced spintronics devices.
  • Controlled surface skyrmion manipulation is key for future technological advancements.