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Related Concept Videos

Faraday's Law01:10

Faraday's Law

6.0K
Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change in the orientation of the area of the coil with respect to the magnetic field induces a voltage (emf). The magnetic flux measures the number of magnetic field lines through a given surface area. Magnetic flux is estimated from the integral of the dot product of the magnetic field vector and the area vector. The negative sign describes the...
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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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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Alkali Metals03:06

Alkali Metals

25.0K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Updated: Feb 13, 2026

On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Method
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On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Method

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Giant Faraday Rotation in Metal-Fluoride Nanogranular Films.

N Kobayashi1, K Ikeda2, Bo Gu3

  • 1Research Institute for Electromagnetic Materials, Tomiya, 981-3341, Japan. n.kobayashi@denjiken.ne.jp.

Scientific Reports
|March 23, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed new nanogranular films with a giant Faraday effect, 40 times stronger than existing materials. This breakthrough could significantly advance optical communications and information technology.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • The magneto-optical Faraday effect is crucial for optical devices, communications, and information technology.
  • Bismuth-substituted Yttrium Iron Garnet (Bi-YIG) has been the primary Faraday material since 1972.

Purpose of the Study:

  • To introduce novel nanogranular films with a significantly enhanced Faraday effect.
  • To explore alternatives to traditional Faraday materials like Bi-YIG.

Main Methods:

  • Fabrication of (Fe, FeCo)-(Al,Y-fluoride) nanogranular films.
  • Characterization of the nanocomposite structure with dispersed ferromagnetic granules.

Main Results:

  • The developed films exhibit a giant Faraday effect, approximately 40 times larger than that of Bi-YIG.
  • The films possess a nanocomposite structure with nanometer-sized Fe and FeCo ferromagnetic granules within an Al,Y-fluoride matrix.

Conclusions:

  • These nanogranular films represent a significant advancement in Faraday materials.
  • The giant Faraday effect observed offers promising potential for next-generation optical devices and technologies.