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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 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...
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...
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
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 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...

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Scanning SQUID Study of Vortex Manipulation by Local Contact
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High domain wall velocities via spin transfer torque using vertical current injection.

Peter J Metaxas1, Joao Sampaio, André Chanthbouala

  • 1Unité Mixte de Physique CNRS/Thales and Université Paris-Sud 11, 1 Ave. A. Fresnel, 91767 Palaiseau, France. peter.metaxas@uwa.edu.au

Scientific Reports
|May 15, 2013
PubMed
Summary

Vertical spin current injection drives domain walls at high speeds in spintronic devices. This method overcomes limitations of traditional lateral current injection, enabling faster data storage and memristive applications.

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Area of Science:

  • Spintronics
  • Materials Science
  • Nanotechnology

Background:

  • Domain walls are crucial for spintronic devices like data storage and memristors.
  • Current methods using lateral spin currents face limitations in speed and current density.
  • Controlling domain wall motion is key for high-speed device operation.

Purpose of the Study:

  • To investigate the potential of vertical spin current injection for driving domain wall motion.
  • To achieve high domain wall velocities and understand switching dynamics.
  • To explore an alternative to traditional spin transfer torque geometries.

Main Methods:

  • Time-resolved magnetotransport measurements.
  • Utilizing magnetic tunnel junctions for vertical spin current injection.
  • Analyzing stochastic and deterministic aspects of domain wall switching.

Main Results:

  • Domain walls were driven over hundreds of nanometers at approximately 500 m/s.
  • Vertical spin current injection achieved this at current densities around 6 MA/cm(2).
  • Insights into stochastic and deterministic domain wall dynamics were obtained.

Conclusions:

  • Vertical spin current injection is an effective method for high-speed domain wall manipulation.
  • This approach offers significant advantages over lateral current injection for spintronic devices.
  • The findings pave the way for advanced data storage and memristive technologies.