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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...
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...
Induced Electric Fields01:23

Induced Electric Fields

The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Updated: Jul 15, 2026

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

Current-induced domain-wall switching in a ferromagnetic semiconductor structure.

M Yamanouchi1, D Chiba, F Matsukura

  • 1Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.

Nature
|April 2, 2004
PubMed
Summary

Researchers demonstrate a new method for magnetic information storage using electrical currents. This approach significantly reduces the required current density, offering a promising alternative for future data storage technologies.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electrical Engineering

Background:

  • Magnetic information storage traditionally uses magnetic fields for magnetization reversal, which requires high field strengths for ultradense devices.
  • Current methods for magnetization reversal using electrical currents in metallic systems necessitate high current densities (10^7-10^8 A cm^-2), exceeding integrated circuit limits.
  • Domain wall manipulation in metallic systems also requires high current densities, posing challenges for practical applications.

Purpose of the Study:

  • To investigate an alternative method for magnetization reversal using electrical currents at significantly reduced densities.
  • To explore the potential of ferromagnetic semiconductor structures for magnetic information encoding.
  • To overcome the limitations of high current densities in current magnetic storage technologies.

Main Methods:

  • Utilized a ferromagnetic semiconductor structure to induce magnetization reversal.
  • Employed electrical current pulses to switch domain walls, thereby reversing magnetization.
  • Investigated magnetization reversal in the absence of an external magnetic field.

Main Results:

  • Demonstrated magnetization reversal through domain-wall switching in a ferromagnetic semiconductor using current pulses.
  • Achieved magnetization reversal with current densities below 10^5 A cm^-2, a significant reduction from existing methods.
  • Identified slow switching speed and low ferromagnetic transition temperature as current limitations.

Conclusions:

  • Magnetization reversal via electric pulses at reduced current densities is feasible in ferromagnetic semiconductors.
  • The developed method offers a potential pathway for future magnetic information storage applications.
  • Further research is needed to address the limitations of switching speed and ferromagnetic transition temperature for practical implementation.