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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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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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Diamagnetism01:26

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Paramagnetism01:30

Paramagnetism

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Magnetic Fields01:27

Magnetic Fields

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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.
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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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...
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Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
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Perspective: Ferromagnetic Liquids.

Robert Streubel1,2, Xubo Liu1,3,4, Xuefei Wu1,3

  • 1Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

Materials (Basel, Switzerland)
|June 19, 2020
PubMed
Summary
This summary is machine-generated.

Magnetic nanoparticle jamming at liquid interfaces creates ferromagnetic liquids with unique properties. This research explores 3D nano-magnetism, curved geometries, and spin frustration in these advanced materials.

Keywords:
ferromagnetic liquidsliquid roboticsmagnetic nanoparticlesmagnetism in curved geometriesself-assembly

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Magnetism

Background:

  • Mechanical jamming of nanoparticles at liquid-liquid interfaces offers a novel method for structuring liquids.
  • Ferromagnetic liquids, distinct from ferrofluids, derive properties from magnetic nanoparticle assembly at interfaces.
  • Minimizing surface tension drives nanoparticle organization at the liquid-liquid interface.

Purpose of the Study:

  • To provide an overview of recent advancements in jamming magnetic nanoparticles.
  • To discuss future research directions, challenges, and applications in 3D nano-magnetism.
  • To explore the formation and characterization of curved magnetic geometries and spin frustration.

Main Methods:

  • Particle jamming at liquid-liquid interfaces.
  • Assembly of magnetic nanoparticles.
  • Characterization of magnetic properties and geometries.

Main Results:

  • Successful formation of ferromagnetic liquids through nanoparticle jamming.
  • Demonstration of remanent magnetization in assembled nanostructures.
  • Investigation of curved magnetic geometries and spin frustration phenomena.

Conclusions:

  • Jamming magnetic nanoparticles is a powerful technique for creating novel magnetic materials.
  • Understanding particle jamming advances the field of 3D nano-magnetism.
  • Potential applications exist in areas requiring tunable magnetic properties and complex structures.