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関連する概念動画

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
Magnetic Fields01:27

Magnetic Fields

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...
Diamagnetism01:26

Diamagnetism

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.
Types Of Superconductors01:28

Types Of Superconductors

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...
Ferromagnetism01:31

Ferromagnetism

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...
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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...

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関連する実験動画

Updated: Jul 5, 2026

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
12:20

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

磁性メタマテリアルから第2ハーモニー生成.

Matthias W Klein1, Christian Enkrich, Martin Wegener

  • 1Institut für Angewandte Physik, Universität Karlsruhe (TH), Wolfgang-Gaede-Strasse 1, D-76131 Karlsruhe, Germany.

Science (New York, N.Y.)
|July 29, 2006
PubMed
まとめ
この要約は機械生成です。

研究者は,スプリットリング共鳴器を使用したメタマテリアルの第2ハーモニック生成の強化を観察しました. 磁気二極共鳴は,固有の磁気ロレンツ力メカニズムにより,電極二極共鳴よりも強い信号を生成しました.

さらに関連する動画

An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature
14:51

An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature

Published on: September 23, 2018

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

関連する実験動画

Last Updated: Jul 5, 2026

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
12:20

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature
14:51

An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature

Published on: September 23, 2018

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

科学分野:

  • メタマテリアルとは
  • 非線形光学は,非線形光学である.
  • プラズモニクスはプラズモニクスを使います.

背景:

  • メタマテリアルには,天然の材料にはないユニークな電磁特性があります.
  • セカンドハーモニック生成 (SHG) は,重要な非線形光学プロセスです.
  • スプリットリング共鳴器 (SRR) は,電気および磁気共鳴を示す基本的なメタマテリアル構造です.

研究 の 目的:

  • スプリットリング共鳴器から成るメタマテリアルの第2ハーモニック生成を調査する.
  • 磁気二極と電気二極共鳴からのSHG信号を比較する.
  • 強化されたSHGに起因する基礎的な物理的メカニズムを探求する.

主な方法:

  • スプリットリング共振器を用いたメタマテリアルの製造.
  • 1.5マイクロメートルの波長でメタマテリアルの刺激.
  • 第2ハーモニー生成信号の測定.
  • ローレンツ力の磁気成分に基づく理論的計算.

主要な成果:

  • SRRメタマテリアルから観測された第2ハーモニック生成.
  • 電極二極共鳴と比較して,磁気二極共鳴を刺激する際に,著しく大きなSHG信号が検出されました.
  • 実験結果は,磁気ロレンツ力に関する理論的予測と一致しています.

結論:

  • ローレンツ力の磁気成分は,メタマテリアルの内在的なSHGメカニズムである.
  • このメカニズムは,SRRの磁気二極共鳴によって著しく強化され,指向されます.
  • メタマテリアルは,新しい非線形光学効果を活用するためのプラットフォームを提供します.