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Related Concept Videos

Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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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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Magnetic Flux01:18

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The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
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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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Motional Emf01:22

Motional Emf

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Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
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π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

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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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Magnetic Field Lines01:19

Magnetic Field Lines

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The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
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Updated: May 21, 2025

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Nearfield control over magnetic light-matter interactions.

Benoît Reynier1, Eric Charron1, Obren Markovic1

  • 1Sorbonne Université, Centre National de la Recherche Scientifique, Institut des NanoSciences de Paris, 75005, Paris, France.

Light, Science & Applications
|March 20, 2025
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Summary
This summary is machine-generated.

Researchers demonstrate nanoscale control over magnetic light-matter interactions. A specially designed plasmonic nanostructure enables energy transfer from magnetic near-fields to nanoparticles, enabling new optical phenomena.

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Area of Science:

  • Nanophotonics
  • Quantum Optics
  • Plasmonics

Background:

  • The magnetic component of light is often overlooked in light-matter interactions, despite its crucial role in phenomena like chiral interactions and forbidden photochemistry.
  • Controlling magnetic light-matter interactions at the nanoscale is essential for advancing optical technologies.

Purpose of the Study:

  • To explore and demonstrate the control of magnetic light-matter interactions at the nanoscale.
  • To investigate energy transfer from magnetic near-fields to nanoparticles using plasmonic nanostructures.

Main Methods:

  • Experimental demonstration using a plasmonic nanostructure designed for subwavelength magnetic confinement.
  • Spatial decoupling of electric and magnetic components of localized plasmonic fields.
  • Studying spontaneous emission from Lanthanide-ion doped nanoparticles.

Main Results:

  • Successful energy transfer from the magnetic near-field to a nanoparticle was achieved via magnetic confinement.
  • Observed a spatial decorrelation between field distributions and local densities of states, contradicting reciprocity.
  • Identified different optical paths for excitation and emission as the cause for the counter-intuitive observation.

Conclusions:

  • Plasmonic nanostructures can effectively control magnetic light-matter interactions at the nanoscale.
  • The design of nanostructures is crucial for manipulating magnetic near-fields and achieving energy transfer.
  • Reciprocity theorem's direct application can be limited in systems with distinct excitation and emission pathways.