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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...
2.4K
Valence Bond Theory02:42

Valence Bond Theory

8.5K
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...
8.5K
Diamagnetism01:26

Diamagnetism

2.4K
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....
2.4K
Properties of Transition Metals02:58

Properties of Transition Metals

25.1K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
25.1K

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Related Experiment Video

Updated: Jun 7, 2025

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

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Ferromagnetic stability optimization via oxygen-vacancy control in single-atom Co/TiO2 nanostructures.

Vinod K Paidi1, Byoung-Hoon Lee2,3, Alex Taekyung Lee4

  • 1Experiments Division, European Synchrotron Radiation Facility, Grenoble 38043, Cedex 9, France.

Proceedings of the National Academy of Sciences of the United States of America
|November 18, 2024
PubMed
Summary

Oxygen vacancies significantly enhance room-temperature ferromagnetism in cobalt-doped titanium dioxide nanoparticles. This finding is crucial for designing advanced dilute magnetic semiconductors.

Keywords:
oxygen vacancyroom-temperature ferromagnetismsingle-atom-incorporated TiO2 nanostructures

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Oxygen vacancies are critical for understanding nanomagnetism and electronic structure in materials.
  • Dilute magnetic semiconductors require precise control over magnetic properties and electronic states.

Purpose of the Study:

  • To investigate the role of oxygen vacancies in the room-temperature ferromagnetism of cobalt single atom-incorporated titanium dioxide (TiO2) nanoparticles.
  • To elucidate the correlation between electronic structure, oxygen vacancies, and magnetic properties.

Main Methods:

  • Synthesis of monodispersed TiO2 nanoparticles with incorporated single cobalt atoms using thermodynamic redistribution.
  • Advanced synchrotron-based X-ray techniques for structural and electronic analysis.
  • Density functional theory (DFT) calculations to model magnetic interactions and electronic structure.

Main Results:

  • Absence of trivalent titanium confirmed, indicating it does not influence ferromagnetic stability.
  • Weak intrinsic ferromagnetic stability between Co2+ ions was observed.
  • Electron doping from oxygen vacancies significantly enhanced ferromagnetic stability, explaining observed room-temperature ferromagnetism.
  • Enhanced ferromagnetic interactions were found for cobalt-oxygen vacancy complexes (CoTi + VO).

Conclusions:

  • Oxygen vacancies are the primary mechanism responsible for room-temperature ferromagnetism in single-atom cobalt-doped TiO2 nanostructures.
  • The findings provide a pathway for designing and optimizing magnetic properties in single-atom doped nanomaterials.
  • The study highlights the potential of thermodynamic redistribution and advanced characterization techniques for exploring magnetism in nanostructures.