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Related Concept Videos

Magnetic Fields01:27

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:
Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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.
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...
Divergence and Curl of Magnetic Field01:26

Divergence and Curl of Magnetic Field

The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

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Magnetic anomalies in CeIn(2).

K Mukherjee1, Kartik K Iyer, E V Sampathkumaran

  • 1Tata Institute of Fundamental Research, Colaba, Mumbai-400005, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 15, 2012
PubMed
Summary

Binary compound CeIn(2) shows unusual ferromagnetic behavior with field-induced transitions. Its magnetic ordering temperature increases with pressure, suggesting it

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Binary compound CeIn(2) exhibits unusual magnetic behavior.
  • Ferromagnetic transition at 22 K is uncommon for Cerium (Ce) systems.

Purpose of the Study:

  • Investigate the magnetic properties of CeIn(2).
  • Clarify the unusual ferromagnetic transition and magnetic behavior.

Main Methods:

  • Magnetization studies
  • Electrical resistivity measurements
  • Heat-capacity measurements
  • Variable temperature, magnetic field, and pressure studies.

Main Results:

  • Observed negative slopes in H/M vs. M(2) plots, indicating field-induced transitions.

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  • Magnetoresistance sign changes from positive to negative with increasing temperature.
  • Magnetic ordering temperature increases with applied pressure up to 20 kbar.

    • Conclusions:

    • CeIn(2) displays complex magnetic behavior, including field-induced transitions.
    • The compound's behavior aligns with the left side of Doniach's magnetic phase diagram.
    • Pressure enhances the ferromagnetic ordering temperature.