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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

9.3K
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...
9.3K
Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

3.4K
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,...
3.4K
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

5.0K
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.
5.0K
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

4.7K
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...
4.7K
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

3.7K
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...
3.7K
Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

5.0K
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: Sep 15, 2025

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

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

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Monopole Current Control in Artificial Spin Ice via Localized Fields.

Julia Frank1, Johan van Lierop1, Robert L Stamps1

  • 1Department of Physics and Astronomy, University of Manitoba, Winnipeg R3T 2N2, Manitoba, Canada.

Nano Letters
|July 16, 2025
PubMed
Summary
This summary is machine-generated.

Researchers controlled magnetic monopole currents in artificial spin ice using external nanomagnets. This method steers magnetic charge transport, offering new possibilities for magnetic memory and logic devices.

Keywords:
Monte Carlo simulationsartificial spin icedipolar interactionsguided monopole currentmagnetic monopolesnanomagnetism

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Artificial spin ice (ASI) systems are nanoscale magnet arrays exhibiting geometric frustration.
  • Dipolar interactions in ASI can lead to emergent magnetic monopole excitations.
  • Controlling these excitations is key for advanced magnetic applications.

Purpose of the Study:

  • To demonstrate control over magnetic monopole currents in square ASI.
  • To investigate the effect of localized fields on monopole nucleation and transport.
  • To enable tailored state transitions and directional magnetic charge transport.

Main Methods:

  • Utilized Monte Carlo simulations to model ASI behavior.
  • Introduced a row of control nanomagnets positioned perpendicular to the ASI lattice.
  • Analyzed the influence of localized fields from control elements on monopole dynamics.

Main Results:

  • Localized fields from control nanomagnets can suppress or promote monopole nucleation.
  • Monopole currents were steered across the lattice with chosen polarity.
  • Control fields were shown to guide state transitions, sometimes opposing the global in-plane field.

Conclusions:

  • A strategy for manipulating collective behaviors in ASI via localized fields was developed.
  • This approach offers precise control over magnetic monopole currents.
  • Potential applications include magnetic memory, reservoir computing, and reconfigurable logic devices.