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Related Concept Videos

Diamagnetism01:26

Diamagnetism

2.5K
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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Paramagnetism01:30

Paramagnetism

2.6K
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...
2.6K
Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

1.0K
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,...
1.0K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

758
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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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.
5.1K

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Iron Nanowire Fabrication by Nano-Porous Anodized Aluminum and its Characterization
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Single Diameter Modulation Effects on Ni Nanowire Array Magnetization Reversal.

Luis C C Arzuza1,2, Victor Vega3, Victor M Prida3

  • 1Physics Institute "Gleb Wataghin", Universidade Estadual de Campinas (UNICAMP), Campinas 13083-859, Brazil.

Nanomaterials (Basel, Switzerland)
|December 24, 2021
PubMed
Summary
This summary is machine-generated.

Diameter-modulated magnetic nanowires offer control over magnetic domain walls. Varying aspect ratios in Ni nanowire arrays alters magnetic behavior, influenced by local stray fields and interactions.

Keywords:
diameter modulationfirst-order reversal curves (FORC)interaction fieldmagnetic nanowiremagnetization reversal

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Geometrically modulated magnetic nanowires control domain wall propagation via diameter changes.
  • Dense nanowire systems experience complex magnetic interactions due to stray fields.

Purpose of the Study:

  • Investigate magnetic behavior in bi-segmented Ni nanowire arrays.
  • Analyze the influence of geometric dimensions, specifically the wide segment's aspect ratio, on magnetization reversal.

Main Methods:

  • Utilized the first-order reversal curve (FORC) method.
  • Employed micromagnetic simulations to interpret results.

Main Results:

  • FORC results show magnetic behavior varies with the length/diameter aspect ratio.
  • Low aspect ratios stabilize pinned domain walls, influenced by axial and radial stray fields.
  • Magnetization reversal is primarily governed by local radial stray fields at the modulation interface.

Conclusions:

  • Diameter modulation effectively modifies magnetic behavior in nanowire arrays.
  • Understanding interplay of short- and long-range fields is crucial for predicting magnetic properties.
  • The study distinguishes complex magnetic behaviors arising from convoluted interaction fields.