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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.0K
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
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Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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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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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

1.4K
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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Paramagnetism01:30

Paramagnetism

2.9K
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

2.9K
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....
2.9K
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

11.3K
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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Magnetic force fields of isolated small nanoparticle clusters.

C Iacovita1, J Hurst, G Manfredi

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Magnetic nanoparticles (NPs) interactions are key to their function. This study shows that the magnetic field from NP clusters doesn't scale with size, emphasizing spatial arrangement for applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Precise control over magnetic nanoparticle (NP) properties is crucial for advanced applications.
  • Understanding interparticle interactions is less developed than single-NP magnetism.

Purpose of the Study:

  • To quantitatively investigate magnetic fields generated by small clusters of NPs.
  • To analyze how NP arrangement affects magnetic stray fields.

Main Methods:

  • Magnetic force microscopy (MFM) was used to measure stray fields.
  • Numerical calculations complemented experimental measurements.
  • Investigated structures from single NPs to five-NP clusters at magnetization saturation.

Main Results:

  • Magnetic stray field intensity does not increase linearly with the number of NPs in a cluster.
  • Both experimental and calculated data highlight the critical role of NP spatial arrangement.
  • Detailed magnetic force field distribution for NP clusters was elucidated.

Conclusions:

  • The spatial arrangement of magnetic nanoparticles significantly impacts their collective magnetic response.
  • Accurate evaluation of NP cluster magnetization requires considering their precise configuration.
  • Findings are relevant for optimizing NP-based technologies and applications.