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Related Concept Videos

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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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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π Electron Effects on Chemical Shift: Overview

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Electronic Structure of Atoms02:28

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An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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Diamagnetism01:26

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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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Paramagnetism01:30

Paramagnetism

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Related Experiment Video

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Ising-Type Magnetic Ordering in Atomically Thin FePS3.

Jae-Ung Lee1, Sungmin Lee2,3, Ji Hoon Ryoo3

  • 1Department of Physics, Sogang University , Seoul 04107, Korea.

Nano Letters
|December 15, 2016
PubMed
Summary

Researchers observed intrinsic antiferromagnetic ordering in two-dimensional iron phosphorus trisulfide (FePS3) down to the monolayer limit. This intrinsic magnetism, stable across thicknesses, opens new avenues for 2D material applications.

Keywords:
FePS3Ising modelRaman spectroscopyantiferromagentismiron phosphorus trisulfidemagnetic ordering in two dimensions

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials offer unique properties for advanced applications.
  • Previous studies on magnetism in 2D materials primarily focused on extrinsic effects like defects and dopants.
  • Intrinsic magnetism in 2D materials remains an underexplored area.

Purpose of the Study:

  • To investigate the presence and nature of intrinsic magnetic ordering in 2D materials.
  • To explore the behavior of magnetism in FePS3 down to the monolayer limit.
  • To understand the influence of dimensionality on magnetic ordering in FePS3.

Main Methods:

  • Utilizing Raman spectroscopy to monitor changes associated with magnetic ordering.
  • Analyzing Raman peak shifts and broadening at the magnetic transition temperature.
  • Comparing experimental findings with theoretical models like the Onsager solution for 2D phase transitions.

Main Results:

  • Demonstrated intrinsic Ising-type antiferromagnetic ordering in FePS3.
  • Observed magnetic ordering persists down to the monolayer limit.
  • Found the transition temperature (TN ≈ 118 K) to be largely independent of sample thickness.

Conclusions:

  • FePS3 exhibits robust intrinsic antiferromagnetic order in the 2D limit.
  • The weak interlayer interactions have minimal impact on the magnetic ordering temperature.
  • This finding is crucial for developing novel spintronic devices based on 2D magnetic materials.