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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.5K
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

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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Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
5.0K
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,...
955

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Related Experiment Video

Updated: Sep 5, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Layer-Dependent Magnetic Domains in Atomically Thin Fe5GeTe2.

Ryuji Fujita1, Pedram Bassirian1,2, Zhengxian Li3

  • 1Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom.

ACS Nano
|July 8, 2022
PubMed
Summary

Exploring magnetic domain formation in two-dimensional (2D) materials like Fe5GeTe2 reveals complex spin textures. Thinner flakes exhibit unique domain fragmentation and spin-reorientation transitions, offering new avenues for spintronics.

Keywords:
Fe3GeTe2Fe5GeTe2magnetic materialstwo-dimensional materialvan der Waals materials

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Magnetic domain formation in 2D materials is crucial for understanding 2D magnetism and developing spintronics.
  • Characterizing magnetic domains in atomically thin van der Waals (vdW) flakes presents significant challenges.

Purpose of the Study:

  • To investigate the layer-resolved magnetic domain structures in the itinerant vdW ferromagnet Fe5GeTe2.
  • To understand the influence of flake thickness on magnetic domain behavior and spin orientation.

Main Methods:

  • Utilized X-ray photoemission electron microscopy (XPEEM) for high-resolution imaging.
  • Performed layer-resolved analysis of domain structures in Fe5GeTe2 flakes of varying thicknesses.

Main Results:

  • Observed labyrinth-type domains in bulk Fe5GeTe2, transitioning to fragmented domains in thinner flakes.
  • Identified a spin-reorientation transition where spins cant in-plane for flakes thinner than six layers.
  • Discovered a bubble phase in four-layer Fe5GeTe2 flakes, deviating from typical 2D magnetic material behavior.

Conclusions:

  • The thickness-dependent magnetic domain evolution in Fe5GeTe2 deviates from single-domain behavior seen in other 2D magnets.
  • Complex spin textures can be stabilized in 2D vdW magnets at relatively high temperatures.
  • Fe5GeTe2 offers exciting prospects for advanced spintronics applications due to its tunable magnetic properties.