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Two-Dimensional (2D) NMR: Overview01:12

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Atomic Nuclei: Nuclear Magnetic Moment00:59

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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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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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Two-dimensional magnetic atomic crystals.

Shanfei Zhang1,2, Hao Wu1,2, Li Yang1,2

  • 1Center for Joining and Electronic Packaging, State Key Laboratory of Material Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China. hxchang@hust.edu.cn.

Materials Horizons
|November 15, 2021
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Summary

This review covers two-dimensional (2D) magnetic atomic crystals, detailing their preparation, properties like ferromagnetism, and applications in heterojunctions. Future challenges and development directions for these advanced materials are also discussed.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Two-dimensional (2D) magnetic atomic crystals exhibit unique physical properties.
  • These materials hold significant potential for diverse device applications.

Purpose of the Study:

  • To review the preparation methods of 2D magnetic atomic crystals.
  • To discuss their key physical properties and device applications.
  • To outline future research directions and challenges.

Main Methods:

  • Chemical Vapor Deposition (CVD)
  • Molecular Beam Epitaxy (MBE)
  • Single-crystal exfoliation

Main Results:

  • Exploration of ferromagnetism, antiferromagnetism, magnetic regulation, and the anomalous Hall effect.
  • Introduction to applications in heterojunctions and other areas.
  • Discussion on the synthesis and characterization of these 2D materials.

Conclusions:

  • 2D magnetic atomic crystals offer a promising platform for next-generation electronic devices.
  • Further research is needed to overcome challenges in large-scale production and device integration.
  • Continued exploration of their fundamental properties will unlock new technological possibilities.