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Related Concept Videos

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...
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 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...
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...
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.

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Related Experiment Video

Updated: Jun 12, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact
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Published on: February 1, 2017

Magnetic domain wall pumping by spin transfer torque.

C T Boone1, I N Krivorotov

  • 1Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.

Physical Review Letters
|May 21, 2010
PubMed
Summary

Spin transfer torque drives magnetic domain wall motion unidirectionally. This enables efficient domain wall pumping using alternating currents, amplified by exciting internal domain wall dynamics.

Area of Science:

  • Spintronics
  • Condensed Matter Physics

Background:

  • Magnetic domain walls (DWs) are crucial for magnetic memory technologies.
  • Controlling DW motion with spin-polarized currents is a key research area.

Purpose of the Study:

  • To investigate the directional response of DWs to spin transfer torque.
  • To explore the potential for DW motion control using alternating currents (DW pumping).

Main Methods:

  • Numerical simulations of spin-polarized current applied parallel to a magnetic domain wall.
  • Analysis of DW displacement under varying current polarities and frequencies.

Main Results:

  • Spin transfer torque induces unidirectional DW motion, independent of current polarity.
  • Demonstration of DW pumping, achieving long-range DW displacement with alternating current.

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Last Updated: Jun 12, 2026

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

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Published on: February 1, 2017

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
09:43

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Published on: November 7, 2017

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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  • Observation of resonant amplification of DW pumping by exciting internal DW degrees of freedom.

    • Conclusions:

    • Unidirectional DW motion driven by spin torque offers a robust mechanism for DW manipulation.
    • DW pumping presents a promising method for efficient, long-range DW displacement.
    • Exciting internal DW dynamics can significantly enhance DW pumping efficiency.