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Related Concept Videos

Motional Emf01:22

Motional Emf

Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the magnetic...
Induced Electric Fields01:23

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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

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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...
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 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...
Induction01:16

Induction

An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
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Universal electromotive force induced by domain wall motion.

Shengyuan A Yang1, Geoffrey S D Beach, Carl Knutson

  • 1Department of Physics, The University of Texas, Austin, Texas, 78712-0264, USA.

Physical Review Letters
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

The electromotive force from moving magnetic domain walls in nanostrips is linked to domain wall frequency via a universal Josephson-like relation. Experimental results validate this theoretical prediction, highlighting the topological nature of domain walls.

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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Nanomagnetism

Background:

  • Magnetic domain walls in nanostrips are crucial for spintronic devices.
  • Understanding the dynamics and resulting electromagnetic phenomena is key for device optimization.
  • Previous studies have explored domain wall motion, but a universal relation for induced emf was lacking.

Purpose of the Study:

  • To theoretically calculate and experimentally verify the electromotive force (emf) induced by a moving magnetic domain wall.
  • To establish a universal relationship governing the induced emf.
  • To connect the induced emf to the topological properties of magnetic domain walls.

Main Methods:

  • Theoretical calculation of the induced electromotive force.
  • Experimental detection of the induced emf in nanostrip devices.
  • Analysis of the emf dependence on domain wall transformation frequency.

Main Results:

  • The induced emf is found to depend solely on the domain wall transformation frequency.
  • A universal Josephson-type relation describes this dependence.
  • The relation is intrinsically linked to the topological nature of the magnetic domain wall.

Conclusions:

  • The theoretical prediction of the emf's dependence on domain wall frequency is experimentally confirmed.
  • The universal Josephson-type relation provides a new framework for understanding domain wall dynamics.
  • The topological characteristics of domain walls play a fundamental role in generating induced electromotive forces.