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Related Concept Videos

Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

323
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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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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Diamagnetism01:26

Diamagnetism

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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.
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....
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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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π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.1K
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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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

1.0K
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Pressure-controlled magnetism in 2D molecular layers.

Yulong Huang1, Arjun K Pathak2, Jeng-Yuan Tsai3

  • 1Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA. yhuang59@buffalo.edu.

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We discovered pressure can control magnetism in 2D molecular magnets. This pressure tuning of interlayer coupling offers new ways to engineer magnetic properties for advanced electronic devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Chemistry

Background:

  • Two-dimensional (2D) magnets offer tunable interlayer coupling for applications like voltage switching and spin filtering.
  • Controlling magnetic order in 2D materials is crucial for next-generation electronics.
  • Atomically thin magnets provide a platform for manipulating interlayer magnetism.

Purpose of the Study:

  • To investigate pressure-controlled interlayer magnetic coupling in molecular layered compounds.
  • To explore the potential of chromium-pyrazine coordination compounds for tunable magnetism.
  • To understand the influence of pressure on magnetic ordering and properties.

Main Methods:

  • Synthesis of molecular layered compounds via chromium-pyrazine coordination.
  • Application of external pressure to study magnetic coupling.
  • Measurement of magnetic properties, including coercivity, under varying pressure conditions.
  • Analysis of alkali metal stoichiometry and composition effects.

Main Results:

  • Room-temperature long-range magnetic ordering was observed and found to be pressure-tunable.
  • A significant coercivity coefficient of up to 4 kOe/GPa was achieved.
  • Interlayer magnetism showed strong dependence on alkali metal stoichiometry and composition.
  • Evidence of charge redistribution and structural transformation under pressure.

Conclusions:

  • Pressure offers an effective method to control interlayer magnetic coupling in 2D molecular magnets.
  • Chromium-pyrazine coordination compounds exhibit unique pressure-dependent magnetic behaviors.
  • These findings open pathways for designing novel pressure-controlled magnetic materials for advanced applications.