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Related Concept Videos

Magnetic Fields01:28

Magnetic Fields

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...
Magnetic Field Lines01:19

Magnetic Field Lines

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:
The Hall Effect01:30

The Hall Effect

Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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...
Magnetic Field due to Moving Charges01:25

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...
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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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
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Magnetic-field modulation experiments on colossal magnetoresistance samples: first results.

F Bridges1, G Brown, D Cao

  • 1Department of Physics, University of California, Santa Cruz 95064, USA. bridges@cats.ucsc.edu

Journal of Synchrotron Radiation
|August 22, 2001
PubMed
Summary

Researchers developed a new magnetic field modulation technique to better detect small changes in manganese-oxygen (Mn-O) pair distribution functions caused by applied magnetic fields.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Magnetism

Background:

  • A small change in the Mn-O pair distribution function width (sigma) was previously observed under an applied magnetic field.
  • Existing methods for detecting magnetic-field-induced changes have limited sensitivity.

Purpose of the Study:

  • To enhance sensitivity to magnetic-field-induced structural changes.
  • To develop and validate a magnetic field modulation technique for X-ray measurements.

Main Methods:

  • A novel magnetic field modulation technique was developed.
  • Two data points (field on and field off) are collected simultaneously at each X-ray energy.
  • The difference between these two datasets quantifies magnetic-field-induced changes.

Main Results:

  • The modulation technique allows for improved detection of subtle structural variations.
  • Results from modulation measurements will be compared with previous static magnetic field experiments.

Conclusions:

  • The magnetic field modulation technique offers a more sensitive approach to studying field-induced structural effects.
  • This method advances the understanding of magnetic field interactions with material structures.