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Related Concept Videos

Magnetic Fields01:27

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...
Magnetic Field Lines01:19

Magnetic Field Lines

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:
Ferromagnetism01:31

Ferromagnetism

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...
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...

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Related Experiment Video

Updated: Jun 14, 2026

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
09:54

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Published on: July 14, 2021

Localized magnetic fields in arbitrary directions using patterned nanomagnets.

Robert P G McNeil1, R Jeff Schneble, Masaya Kataoka

  • 1Cavendish Laboratory, University of Cambridge, Cambridge, U.K. rpgm2@cam.ac.uk

Nano Letters
|April 10, 2010
PubMed
Summary
This summary is machine-generated.

Researchers developed patterned magnetic elements for precise local magnetic field control. These elements create strong, confined magnetic fields essential for advancing spintronics and quantum technologies.

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Cell Patterning Using Magnetic-Archimedes Strategy
05:09

Cell Patterning Using Magnetic-Archimedes Strategy

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Last Updated: Jun 14, 2026

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
09:54

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Published on: July 14, 2021

Cell Patterning Using Magnetic-Archimedes Strategy
05:09

Cell Patterning Using Magnetic-Archimedes Strategy

Published on: February 2, 2024

Area of Science:

  • Spintronics and Quantum Information Technology

Background:

  • Precise control of local magnetic fields is crucial but underdeveloped for spintronics and quantum technologies.
  • Current methods for generating local magnetic fields are limited in strength and directional control.

Purpose of the Study:

  • To design novel patterned magnetic elements for generating strong, localized, and directional magnetic fields.
  • To enable tunable magnetic field landscapes for applications in quantum information processing and spintronics.

Main Methods:

  • Utilizing patterned magnetic elements to create specific remanent magnetic field profiles.
  • Designing elements to produce fields perpendicular to an external initializing field.
  • Incorporating the potential for electric field modulation of magnetic properties.

Main Results:

  • Demonstrated designs capable of producing remanent magnetic fields of 50 mT, with potential up to 200 mT.
  • Achieved confinement of magnetic fields to submicrometer regions with controllable orientations.
  • Confirmed modeling predictions through experimental measurements using electron holography.

Conclusions:

  • Patterned magnetic elements offer a viable solution for advanced local magnetic field control.
  • The developed designs pave the way for enhanced capabilities in spintronics and quantum information technologies.
  • The ability to create tunable magnetic landscapes opens new avenues for manipulating quantum states.