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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.2K
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...
7.2K
Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

5.8K
A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
Consider a solenoid with 100 turns wrapped around a cylinder of...
5.8K
Magnetic Field Lines01:19

Magnetic Field Lines

5.6K
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.
Magnetic field lines follow several hard-and-fast rules:
5.6K
Energy In A Magnetic Field01:24

Energy In A Magnetic Field

2.7K
If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus...
2.7K
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

6.3K
Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
6.3K
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

11.6K
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...
11.6K

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Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries
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Controlling Grain Boundaries by Magnetic Fields.

R Backofen1, K R Elder2, A Voigt1,3

  • 1Institute of Scientific Computing, Technische Universität Dresden, 01062 Dresden, Germany.

Physical Review Letters
|April 13, 2019
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Summary
This summary is machine-generated.

External magnetic fields can engineer material microstructure by influencing defect and grain boundary evolution. This study uses a phase-field-crystal model to simulate these effects on grain growth.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Controlling material microstructure is crucial for advanced engineering applications.
  • Understanding the interplay between electromagnetic fields and solid-state matter transport is complex.
  • External magnetic fields offer a potential tool for microstructural engineering.

Purpose of the Study:

  • To investigate the influence of external magnetic fields on polycrystalline material microstructure.
  • To explore the interactions between electromagnetic fields and solid-state matter transport.
  • To analyze the role of magnetic fields in defect structure and grain boundary evolution.

Main Methods:

  • Utilized a phase-field-crystal model for simulating material behavior.
  • Developed efficient and scalable numerical algorithms for analysis.
  • Conducted large-scale 2D simulations to gather statistical data on grain growth.
  • Examined atomistic processes using examples of planar and circular grain boundaries.

Main Results:

  • External magnetic fields were shown to influence defect structures and grain boundaries.
  • Simulations provided insights into atomistic processes governing microstructural evolution.
  • Statistical data on grain growth under magnetic field influence were obtained.
  • The phase-field-crystal model proved effective in studying these phenomena.

Conclusions:

  • External magnetic fields can be leveraged for microstructural engineering.
  • The study elucidates the mechanisms by which magnetic fields affect matter transport and microstructure.
  • Phase-field-crystal modeling is a viable approach for simulating magnetic field effects in materials.