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Magnetic Field Of A Current Loop

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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.
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Related Experiment Video

Updated: Mar 20, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact

Scanning SQUID Study of Vortex Manipulation by Local Contact

Published on: February 1, 2017

Imprinting superconducting vortex footsteps in a magnetic layer.

Jérémy Brisbois¹, Maycon Motta², Jonathan I Avila¹

¹Université de Liège, Département de Physique, Sart Tilman, B-4000, Belgium.

Scientific Reports

|June 7, 2016

Summary

Superconducting vortices imprint their paths onto magnetic permalloy layers, similar to a magnetic drawing board. This interaction, observed in niobium and permalloy films, offers new possibilities for magnetic recording.

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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Published on: July 20, 2022

Area of Science:

Condensed Matter Physics
Materials Science
Magnetism

Background:

Local polarization of magnetic layers is a fundamental principle for information storage.
Applications range from toys to credit cards and hard drives.
Superconducting vortices are quantum units of magnetic flux.

Purpose of the Study:

To experimentally demonstrate imprinting superconducting vortex trajectories onto a soft magnetic layer.
To investigate the interaction between superconducting vortices and ferromagnetic domains.
To explore potential applications in magnetic recording.

Main Methods:

Utilizing a superconducting niobium (Nb) film and a soft magnetic permalloy (Py) layer.
Employing magneto-optical imaging to observe the interactions.
Comparing results for thick and thin permalloy layers.

Main Results:

Superconducting vortices act as 'magnetic scribers,' leaving polarized imprints in the permalloy.
In thin permalloy layers, clear magnetic moment imprints of vortex paths were observed.
Magnetic domain patterns in thick permalloy influenced vortex penetration and avalanches.
Flux was consistently delayed at the magnetic layer border.

Conclusions:

Superconducting vortex trajectories can be recorded in magnetic materials.
Thin permalloy layers without stripe domains provide the clearest imprints.
The findings pave the way for optimizing magnetic recording of vortex dynamics.