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Related Concept Videos

Induction01:16

Induction

4.6K
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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Induced Electric Fields01:23

Induced Electric Fields

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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

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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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Electromagnetic Fields01:30

Electromagnetic Fields

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Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
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Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Dual Nature of Electromagnetic (EM) Radiation01:10

Dual Nature of Electromagnetic (EM) Radiation

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Electromagnetic (EM) radiation consists of electric and magnetic field components oscillating in planes perpendicular to each other and mutually perpendicular to radiation propagation through space. EM radiation can be classified as a wave, characterized by the properties of waves such as wavelength (denoted as λ) and frequency (represented by ν).
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the...
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Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
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Emergent electromagnetic induction beyond room temperature.

Aki Kitaori1, Naoya Kanazawa1, Tomoyuki Yokouchi2

  • 1Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan; kitaori-aki055@g.ecc.u-tokyo.ac.jp kanazawa@ap.t.u-tokyo.ac.jp nagaosa@riken.jp tokura@riken.jp.

Proceedings of the National Academy of Sciences of the United States of America
|August 14, 2021
PubMed
Summary

Researchers achieved significant emergent electromagnetic induction near room temperature using metallic helimagnets. This breakthrough in quantum inductors operates at higher temperatures, paving the way for miniaturized electronic components.

Keywords:
emergent inductorroom temperaturespiral magnet

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Area of Science:

  • Condensed Matter Physics
  • Quantum Electromagnetism
  • Materials Science

Background:

  • Emergent electromagnetic induction from noncollinear spin states offers potential for miniaturizing inductor elements.
  • Current research is limited by low operating temperatures and unknown thermal agitation effects on quantum processes.
  • Room-temperature operation is a critical challenge for practical applications of emergent electromagnetic induction.

Purpose of the Study:

  • To investigate emergent electromagnetic induction at and above room temperature.
  • To explore the influence of temperature, magnetic fields, and current density on inductance.
  • To assess the feasibility of room-temperature quantum inductors based on spin-helix states.

Main Methods:

  • Fabrication of micrometer-sized devices utilizing metallic helimagnets with high-temperature spin-spiral states (up to 330 K, period ≤ 3 nm).
  • Measurement of emergent electromagnetic induction and inductance (L) values.
  • Systematic variation of temperature, applied magnetic field, and applied current density to study their effects.

Main Results:

  • Large emergent electromagnetic induction was achieved around and above room temperature.
  • Inductance value (L) and its sign demonstrated significant variability.
  • Observed variations in L were dependent on spin-helix structure (controlled by temperature and magnetic field) and current density.

Conclusions:

  • The study demonstrates room-temperature operation of emergent electromagnetic induction.
  • Control over the sign of inductance is achievable, a crucial factor for device application.
  • These findings represent a significant step toward realizing microscale quantum inductors using emergent electromagnetism in spin-helix states.