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Related Concept Videos

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...
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...
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 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 Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...

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Related Experiment Video

Updated: Jul 16, 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

Vortex polarity switching by a spin-polarized current.

Jean-Guy Caputo1, Yuri Gaididei, Franz G Mertens

  • 1Laboratoire de Mathématiques, INSA de Rouen, B.P. 8, 76131 Mont-Saint-Aignan cedex, France. caputo@insa-rouen.fr

Physical Review Letters
|March 16, 2007
PubMed
Summary

Spin-transfer effects in magnetic nanodots reveal that electric currents can switch vortex polarity. This finding is crucial for developing advanced magnetic storage devices.

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Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques
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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Investigating spin-transfer effects in magnetic nanodot vortex states.
  • Understanding the behavior of spin currents in magnetic nanostructures.

Purpose of the Study:

  • To analyze the spin-transfer effect on magnetic vortex polarity.
  • To determine the most effective method for switching vortex polarity in nanodots.

Main Methods:

  • Theoretical analysis of spin-transfer dynamics.
  • Simulations using spin-lattice models.
  • Energy analysis of magnetic vortex states.

Main Results:

  • Spin current acts as an effective magnetic field perpendicular to the nanodot.
  • Vortices with magnetization parallel to current polarization are energetically favorable.
  • Electric current is more effective than magnetic fields for polarity switching.

Conclusions:

  • Predicts polarity switching of magnetic vortices using spin-transfer effects.
  • Highlights the potential of electric currents for magnetic storage applications.