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Related Concept Videos

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...
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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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The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
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Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Magnetic Field Of A Current Loop01:16

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Picometer-Precision Atomic Position Tracking through Electron Microscopy
15:04

Picometer-Precision Atomic Position Tracking through Electron Microscopy

Published on: July 3, 2021

Beyond the compact magnetic domain wall.

C Zinoni1, A Vanhaverbeke, P Eib

  • 1IBM Research-Zurich, Rüschlikon, Switzerland.

Physical Review Letters
|December 21, 2011
PubMed
Summary
This summary is machine-generated.

Domain wall mobility in submicrometer wires is limited by complex structures, not compact entities. These dynamic domain walls exhibit multiple substructures moving at varying velocities.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Understanding domain wall dynamics is crucial for developing advanced magnetic memory and logic devices.
  • Current models often simplify domain walls as compact entities, potentially overlooking complex behaviors.

Purpose of the Study:

  • To investigate the fundamental mechanisms limiting domain wall mobility in wide submicrometer wires.
  • To explore the dynamic structure of domain walls beyond simplified models.

Main Methods:

  • Experimental investigation using magneto-optical Kerr effect (MOKE).
  • Computational analysis through micromagnetic simulations.

Main Results:

  • The dynamic domain wall structure deviates significantly from a compact entity model.
  • Domain walls are revealed to be composed of multiple substructures.
  • Each substructure propagates and evolves in distinct dynamic regimes with different velocities.

Conclusions:

  • The mobility of domain walls is governed by the complex interplay of its substructures.
  • Existing simplified models are insufficient to capture the full picture of domain wall dynamics.
  • Further research into these substructures is necessary for optimizing spintronic devices.