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関連する概念動画

Ferromagnetism01:31

Ferromagnetism

2.9K
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...
2.9K
Types Of Superconductors01:28

Types Of Superconductors

1.5K
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
1.5K
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

1.5K
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...
1.5K
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

1.7K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.7K
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

4.1K
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
4.1K
Eddy Currents01:25

Eddy Currents

2.3K
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...
2.3K

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関連する実験動画

Updated: Dec 22, 2025

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
09:09

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Published on: February 5, 2020

7.5K

鉄基バイナリ・フェロマグネット

Akito Sakai1,2,3, Susumu Minami4,5, Takashi Koretsune6

  • 1Institute for Solid State Physics, University of Tokyo, Kashiwa, Japan.

Nature
|May 8, 2020
PubMed
まとめ
この要約は機械生成です。

研究者は,鉄にアルミニウムとガリウムをドーピングすることで,エネルギー収集のための異常なネルスト効果 (ANE) を強化しました. この突破は熱電性能と 柔軟な発電機の材料の可能性を高めます

さらに関連する動画

Author Spotlight: Advancements in High-Performance Thermoelectric Thin Films Through Radio Frequency Magnetron Sputtering
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics

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関連する実験動画

Last Updated: Dec 22, 2025

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Author Spotlight: Advancements in High-Performance Thermoelectric Thin Films Through Radio Frequency Magnetron Sputtering
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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Published on: August 30, 2024

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科学分野:

  • 材料科学
  • 凝縮物質物理学
  • 固体物理学

背景:

  • 異常なネルスト効果 (ANE) を利用した熱電発電は,横断幾何学によりエネルギー収集の可能性を秘めています.
  • ANEの性能,コスト,安全性,安定性を改善することは,実用的なアプリケーションにとって極めて重要です.
  • ANEは,フェルミエネルギー近くの伝導電子のベリー曲線から発生します.

研究 の 目的:

  • 異常なネルスト効果を 劇的に強化する材料を コンピューターで探す
  • ANEの強化を担当する電子構造を調べる
  • 低コストで柔軟な熱電発電機を開発する.

主な方法:

  • アルファ鉄のドーパントの 計算式検索
  • 電子構造とベリーの曲線を 調べている
  • 実験的な検証のために薄膜を製造する.

主要な成果:

  • アルファ鉄を25%のアルミニウムやガリウムで ドーピングすると ANEが10倍以上増加します
  • 室温で1ケルビンあたり約4〜6マイクロボルトのANE値を達成した.
  • 断面的熱電係数の強力な強化の鍵としてノードネットワークへのフェルミエネルギーチューニングを特定しました.

結論:

  • ドーピングされた鉄は ANEを大幅に高め 記録的な値に近づいています
  • 高性能なANEには,ノードネットワーク構造へのフェルミエネルギーチューニングが不可欠です.
  • 製造された薄膜は低コストで柔軟な熱電発電機の可能性を示しています.