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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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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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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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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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Atomic Nuclei: Nuclear Spin State Overview01:03

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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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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Atomically sharp domain walls in an antiferromagnet.

Filip Krizek1, Sonka Reimers2,3, Zdeněk Kašpar1,4

  • 1Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 00 Praha 6, Czech Republic.

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Summary
This summary is machine-generated.

Researchers visualized nanoscale magnetic textures in antiferromagnetic copper manganese arsenide (CuMnAs) using advanced microscopy. This reveals atomic-scale domain walls, crucial for future magnetic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Understanding magnetic textures like domain walls is vital for magnetism research and information technologies.
  • Antiferromagnetic materials offer potential for advanced electronic devices due to their unique properties.

Purpose of the Study:

  • To investigate the scaling limits of magnetic textures in antiferromagnetic materials at the nanoscale.
  • To identify and characterize domain walls in antiferromagnetic copper manganese arsenide (CuMnAs) down to the atomic level.

Main Methods:

  • Utilized X-ray photoemission electron microscopy (XPEEM) to image magnetic textures.
  • Employed aberration-corrected scanning transmission electron microscopy (STEM) with differential phase-contrast (DPC) imaging for atomic resolution.

Main Results:

  • Successfully imaged magnetic textures in CuMnAs down to the nanoscale, reaching the detection limits of XPEEM.
  • Achieved atomic resolution, identifying abrupt domain walls corresponding to Néel order reversal between atomic planes.

Conclusions:

  • Demonstrated the capability to study magnetic textures at the ultimate atomic scale in antiferromagnets.
  • Findings provide insights for developing novel antiferromagnetic devices with magnetic field-insensitive neuromorphic functionalities.