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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.9K
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...
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Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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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.
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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

12.4K
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...
12.4K
Ferromagnetism01:31

Ferromagnetism

3.5K
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...
3.5K
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

5.4K
Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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A ferromagnet in a continuously tunable random field.

D M Silevitch1, D Bitko, J Brooke

  • 1The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA.

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|August 3, 2007
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Summary
This summary is machine-generated.

Disordered magnets exhibit a singular magnetic response above their Curie temperature, which diverges anomalously at T(C). This finding advances understanding of the random field problem and offers insights into domain wall pinning for applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Most physical systems are disordered, yet theoretical models often treat disorder as a minor perturbation.
  • Ferromagnets near their Curie temperature (T(C)) typically show suppressed critical behavior with random chemical substitution.
  • Bulk measurements in disordered ferromagnets usually do not reveal qualitatively new phenomena below a critical disorder level.

Purpose of the Study:

  • To investigate the magnetic response of a model disordered magnet.
  • To identify novel phenomena in disordered magnetic systems.
  • To explore the implications for fundamental physics and technological applications.

Main Methods:

  • Studying a model disordered magnet system.
  • Measuring magnetic response, particularly susceptibility.
  • Applying an external magnetic field transverse to the magnetization direction.

Main Results:

  • A singular magnetic response was observed above the Curie temperature (T(C)).
  • This singularity exhibited an anomalous divergence precisely at T(C).
  • The response originates from a random internal field induced by a transverse external magnetic field.

Conclusions:

  • Disordered magnets display unique behavior near their Curie temperature.
  • The observed phenomena are linked to the random field effect in magnetic systems.
  • Findings suggest potential for tuning domain wall pinning, crucial for magnetic applications.