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Magnetic Fields01:27

Magnetic Fields

6.0K
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...
6.0K
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

3.8K
Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
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Magnetic Force01:18

Magnetic Force

2.4K
In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
2.4K
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

924
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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Ferromagnetism01:31

Ferromagnetism

2.8K
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...
2.8K
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

11.3K
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...
11.3K

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A multifunctional magnetic material under pressure.

J Alberto Rodríguez-Velamazán1, Oscar Fabelo, Christine M Beavers

  • 1Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC and Universidad de Zaragoza, Plaza San Francisco, 50009, Zaragoza, Spain; Institut Laue-Langevin, 38042 Grenoble Cedex, France. jarv@unizar.es.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 9, 2014
PubMed
Summary

This study reveals that applying pressure to Fe(II)(Metz)6](Fe(III)Br4)2 enhances its magnetic ordering and induces a spin-state transition. The Néel temperature increases with pressure, enabling a full high-spin to low-spin switch.

Keywords:
X-ray diffractionmagnetic propertiesneutron diffractionpressure effectsspin crossover

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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Magnetism

Background:

  • The compound Fe(II)(Metz)6](Fe(III)Br4)2 exhibits a rare combination of spin-crossover and long-range magnetic ordering.
  • Understanding the interplay between these phenomena is crucial for designing advanced magnetic materials.

Purpose of the Study:

  • To investigate the magnetic structure and spin-state behavior of Fe(II)(Metz)6](Fe(III)Br4)2 under varying pressure conditions.
  • To determine the effect of pressure on the Néel temperature and spin-crossover transition.

Main Methods:

  • Joint neutron and X-ray diffraction studies were employed to determine the magnetic structure.
  • Magnetometry measurements were conducted to assess magnetic properties and spin transitions.
  • Variable-pressure experiments were performed using a diamond anvil cell.

Main Results:

  • A collinear antiferromagnetic structure was identified for Fe(II)(Metz)6](Fe(III)Br4)2.
  • The Néel temperature (T_N) increased from 2.4 K at ambient pressure to 3.9 K at 0.95 GPa.
  • Applied pressure induced a complete high-spin to low-spin transition at room temperature.

Conclusions:

  • Pressure significantly influences the magnetic ordering and spin-state transitions in Fe(II)(Metz)6](Fe(III)Br4)2.
  • The observed pressure-induced spin-crossover at ambient temperature offers potential for pressure-controlled molecular switches.
  • This system serves as a model for exploring coupled spin dynamics in functional materials.