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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

6.9K
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 Moving Charges01:23

Magnetic Field due to Moving Charges

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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...
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Diamagnetism01:26

Diamagnetism

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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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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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Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

2.3K
An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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Induction01:16

Induction

5.3K
An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
A...
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Related Experiment Video

Updated: Dec 6, 2025

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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Magnetic-Pole Flip by Millimeter Wave.

Shin-Ichi Ohkoshi1, Marie Yoshikiyo1, Kenta Imoto1

  • 1Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.

Advanced Materials (Deerfield Beach, Fla.)
|October 8, 2020
PubMed
Summary

A new magnetic recording method, focused-millimeter-wave-assisted magnetic recording (F-MIMR), uses terahertz light to switch magnetic pole direction. This technique promises suppressed heat-up effects for high-density data archiving.

Keywords:
epsilon iron oxidemagnetic recordingmagnetization reversalmillimeter wavesnanoparticles

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Area of Science:

  • Materials Science
  • Data Storage Technologies
  • Nanotechnology

Background:

  • Data archiving is crucial in the Big Data era, with magnetic recording offering long-term storage solutions.
  • Increasing recording density is essential for archiving vast amounts of data.
  • Existing magnetic recording methods face limitations in achieving ultra-high densities.

Purpose of the Study:

  • To propose and evaluate a novel magnetic recording methodology called focused-millimeter-wave-assisted magnetic recording (F-MIMR).
  • To investigate the potential of F-MIMR for enhancing data storage density and efficiency.
  • To explore the suppression of heat-up effects in recording media during high-density operations.

Main Methods:

  • Preparation of magnetic films using epsilon iron oxide nanoparticles.
  • Construction of a focused-millimeter-wave generator utilizing terahertz (THz) light.
  • Experimental irradiation of epsilon iron oxide with focused millimeter waves to induce magnetic pole switching.
  • Computational analysis of spin dynamics using the stochastic Landau-Lifshitz-Gilbert model.

Main Results:

  • Focused millimeter-wave irradiation successfully achieved instant magnetic pole switching in epsilon iron oxide.
  • Simulations indicated that F-MIMR is expected to suppress the heat-up effect in recording media.
  • The methodology demonstrated potential for enabling high-density magnetic recordings.

Conclusions:

  • Focused-millimeter-wave-assisted magnetic recording (F-MIMR) is a viable new method for magnetic data storage.
  • F-MIMR offers a promising approach to overcome limitations in current data archiving technologies.
  • The technique holds potential for future advancements in high-density magnetic recording applications.