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Related Concept Videos

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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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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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.
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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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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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Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Two-Dimensional Co2S2 monolayer with robust ferromagnetism.

Yun Zhang1, Jingman Pang2, Meiguang Zhang1

  • 1Department of Physics and Information Technology, Baoji University of Arts and Sciences, Baoji, 721016, China.

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Researchers discovered a new 2D cobalt sulfide (Co2S2) material with intrinsic ferromagnetism. This stable ferromagnetic metal, with potential for spintronics, can be synthesized via chemical exfoliation.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials with intrinsic ferromagnetism are crucial for advancing spintronics.
  • Developing novel 2D magnetic materials remains a significant challenge.

Purpose of the Study:

  • To identify and characterize a new 2D ferromagnetic material.
  • To explore its stability and potential synthesis methods.

Main Methods:

  • First-principles calculations.
  • Particle swarm optimization (PSO) for global structure search.
  • Phonon spectrum and molecular dynamics simulations.

Main Results:

  • Discovery of a stable 2D cobalt sulfide (Co2S2) in a tetragonal structure (P4/nmm).
  • Confirmation of mechanical, dynamical, and thermal stability.
  • Identification as a ferromagnetic metal with a Curie temperature of 404 K.

Conclusions:

  • The novel 2D Co2S2 material exhibits robust intrinsic ferromagnetism and stability.
  • A feasible synthesis route via chemical exfoliation from bulk TlCo2S2 is proposed.
  • This discovery opens new avenues for 2D spintronics applications.