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Related Concept Videos

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...
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Faraday Disk Dynamo01:23

Faraday Disk Dynamo

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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Eddy Currents01:25

Eddy Currents

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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
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Energy In A Magnetic Field01:24

Energy In A Magnetic Field

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If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus...
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Magnetic Force01:18

Magnetic Force

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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...
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Magnetic Damping01:17

Magnetic Damping

1.3K
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

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Spin-engineering magnetic media.

S P Li1, W S Lew, J A C Bland

  • 1Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK. jacb1@phy.cam.ac.uk

Nature
|February 8, 2002
PubMed
Summary
This summary is machine-generated.

New magnetic media use engineered spin configurations in homogeneous films to increase data-storage density. This method alters magnetic anisotropy for regular spin arrangements, maintaining material integrity and surface planarity.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Growing demand for higher data-storage density necessitates novel magnetic media.
  • Current magnetic storage technologies face limitations in density and stability.

Purpose of the Study:

  • To introduce a new type of magnetic medium with engineered spin configurations.
  • To demonstrate a method for defining regular in-plane and out-of-plane spin arrangements.
  • To maintain surface planarity and material homogeneity in advanced magnetic media.

Main Methods:

  • Engineering spin configurations within chemically homogeneous magnetic films.
  • Altering magnetic anisotropy to define specific spin arrangements.
  • Utilizing simple and easily integrable fabrication techniques.

Main Results:

  • Successfully created regularly arranged in-plane and out-of-plane spin configurations.
  • Maintained the surface planarity of the magnetic films.
  • Preserved the chemical homogeneity of the magnetic materials.

Conclusions:

  • The developed spin-engineered media offer a promising approach for next-generation data storage.
  • The method's simplicity and ease of integration suggest rapid applicability.
  • This technique addresses the need for increased data-storage density in magnetic media.