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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
Magnetic Fields01:28

Magnetic Fields

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...
Diamagnetism01:26

Diamagnetism

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.
Magnetic Field due to Moving Charges01:25

Magnetic Field due to Moving Charges

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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Updated: Jul 18, 2026

Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment
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Optomagnetism with a plasmonic skyrmion.

Vage Karakhanyan, Thierry Grosjean

    Optics Letters
    |June 14, 2024
    PubMed
    Summary

    Researchers explored how plasmonic Neel skyrmions generate optomagnetism in gold films. Focused vortex beams optimize this effect, enabling new applications in all-optical magnetization switching and magnetic recording.

    Area of Science:

    • Optics and Magnetism
    • Plasmonics
    • Spintronics

    Background:

    • Optical waves can induce ultrafast magnetism.
    • Magnetic skyrmions are analogs of magnetic states with potential for novel spin-optical states.

    Purpose of the Study:

    • To investigate the creation of an optomagnetic field using plasmonic Neel skyrmions in a thin gold film.
    • To determine the optimal conditions for generating optomagnetism via plasmonic skyrmions.

    Main Methods:

    • Generation of plasmonic Neel skyrmions using a focused radially polarized vortex beam (RPVB).
    • Experimental and theoretical analysis of the induced optomagnetic field in a thin gold film.

    Main Results:

    • Plasmionic Neel skyrmions effectively create an opto-induced stationary magnetic field.

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  • A focused RPVB is optimal for generating optomagnetism with plasmonic Neel skyrmions in gold films.

    • Conclusions:

    • Optical skyrmions provide enhanced control over optomagnetism in plasmonic nanostructures.
    • This research has direct applications in all-optical magnetization switching, magnetic recording, and spin wave excitation.