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Related Concept Videos

Colors and Magnetism03:02

Colors and Magnetism

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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...
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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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Ferromagnetism01:31

Ferromagnetism

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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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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.4K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.6K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Related Experiment Video

Updated: Jan 10, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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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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Polymorphic Spin Ordering in a Single-Crystalline Cobalt-Doped Fe3GaTe2.

Woohyun Cho1, Jaehun Cha1, Yoon-Gu Kang1

  • 1Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea.

ACS Nano
|November 25, 2025
PubMed
Summary

Cobalt-doped Fe3GaTe2 exhibits polymorphic spin ordering, displaying three distinct magnetic states—ferromagnetic, collinear antiferromagnetic, and noncollinear antiferromagnetic—within a single crystal. This discovery offers new avenues for controlling spin states in advanced materials.

Keywords:
2D materialsanomalous Hall effectcircular dichroism angle-resolved photoemission spectroscopyco-doped Fe3GaTe2magnetismpolymorphism

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Single-crystalline systems typically exhibit a unique spin ordering below a critical temperature.
  • Van der Waals magnets offer control over spin states through interlayer exchange interactions.
  • Controlling multiple magnetic states in a single material is a significant challenge.

Purpose of the Study:

  • To investigate the magnetic properties of cobalt-doped Fe3GaTe2 ((Co, Fe)3GaTe2).
  • To explore the phenomenon of multiple magnetic phase transitions in a single material.
  • To understand the role of doping in modulating magnetic interactions and spin ordering.

Main Methods:

  • Synthesis of single-crystalline (Co, Fe)3GaTe2.
  • Magnetic force microscopy for visualizing spin ordering.
  • First-principles calculations to model electronic structure.
  • Circular dichroism angular photoemission spectroscopy (CDAS) to probe electronic states.

Main Results:

  • Observed three distinct magnetic states: ferromagnetic, collinear antiferromagnetic, and noncollinear antiferromagnetic ordering in (Co, Fe)3GaTe2.
  • Identified three critical temperatures: Curie temperature (Tc = 210 K) and two Néel temperatures (TN1 = 110 K, TN2 = 30 K).
  • Demonstrated polymorphic spin ordering within the same lattice system due to modulated interlayer magnetic interactions.

Conclusions:

  • Co-doping in Fe3GaTe2 enables polymorphic spin ordering, a novel phenomenon in layered magnets.
  • The material exhibits significant changes in topological band structure and Berry curvature across magnetic transitions.
  • Findings provide a new platform for exploring complex spin textures and their control in van der Waals materials.