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Related Concept Videos

Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Magnetic Field due to Moving Charges01:23

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...
Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...

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Related Experiment Video

Updated: Jul 3, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact
06:53

Scanning SQUID Study of Vortex Manipulation by Local Contact

Published on: February 1, 2017

Current-driven vortex oscillations in metallic nanocontacts.

Q Mistral1, M van Kampen, G Hrkac

  • 1Institut d'Electronique Fondamentale, UMR CNRS 8622, Université Paris-Sud, 91405 Orsay cedex, France.

Physical Review Letters
|July 23, 2008
PubMed
Summary
This summary is machine-generated.

We observed spin-transfer oscillations in metallic nanocontacts caused by magnetic vortex motion. This vortex movement outside the contact region aligns with theoretical and simulation predictions.

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Last Updated: Jul 3, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact
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Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels
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Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Magnetic vortices are dynamic spin structures in nanomagnets.
  • Spin-transfer effects are crucial for spintronic device operation.
  • Understanding vortex dynamics in nanocontacts is key for novel device applications.

Purpose of the Study:

  • To experimentally demonstrate subgigahertz spin-transfer oscillations.
  • To investigate the role of magnetic vortex translational motion.
  • To validate findings with theoretical models and simulations.

Main Methods:

  • Fabrication and characterization of metallic nanocontacts.
  • Experimental measurement of spin-transfer oscillations.
  • Analysis of magnetic vortex dynamics using micromagnetics simulations.
  • Comparison with analytical theory.

Main Results:

  • Experimental evidence of subgigahertz spin-transfer oscillations was obtained.
  • The oscillations are directly linked to the translational motion of a magnetic vortex.
  • The magnetic vortex exhibits large-amplitude orbital motion outside the nanocontact.
  • Excellent agreement was found between experimental data, theory, and simulations.

Conclusions:

  • Translational motion of magnetic vortices can induce observable spin-transfer oscillations.
  • Metallic nanocontacts provide a platform for studying vortex dynamics.
  • The findings support the potential for vortex-based spintronic devices.