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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
Reflection of Waves01:07

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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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The de Broglie Wavelength02:32

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Domain wall propagation through spin wave emission.

X S Wang1, P Yan, Y H Shen

  • 1Physics Department, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.

Physical Review Letters
|December 11, 2012
PubMed
Summary

Domain walls in magnetic insulators move via spin waves at low fields. Damping can destabilize this motion even below the Walker breakdown field, impacting magnetic device performance.

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Area of Science:

  • Condensed matter physics
  • Magnetism

Background:

  • Domain walls are crucial for magnetic memory technologies.
  • Understanding their motion under external fields is key for device optimization.

Purpose of the Study:

  • To theoretically investigate field-induced domain wall motion.
  • To analyze the impact of damping on domain wall dynamics in magnetic insulators.

Main Methods:

  • Theoretical study of domain wall propagation.
  • Analysis of spin wave emission and soliton dynamics.
  • Investigation of Walker rigid-body propagation mode stability.

Main Results:

  • Domain walls propagate via dissipationless spin wave emission at low fields.
  • The Walker propagation mode can become unstable with damping.
  • Instability occurs at magnetic fields below the Walker breakdown field.

Conclusions:

  • Field-induced domain wall motion is complex and influenced by damping.
  • Damping introduces instabilities not present in ideal, dissipationless systems.
  • Findings are relevant for designing robust magnetic memory devices.