関連する実験動画
Updated: Jun 14, 2025

06:42
Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
9.5K
角運動量による磁気制御のシグネチャー
L Chen1, Y Sun2, S Mankovsky3
1Department of Physics, Technical University of Munich, Munich, Germany. lin0.chen@tum.de.
Nature
|September 4, 2024
まとめ
プラチナの層に電流を当てると 隣接する鉄の膜の磁気特性が変化します この発見は,高度なスピントロニックデバイスを開発するための新しい可能性を提供します.
科学分野:
- 凝縮物質物理学
- 材料科学
- スピントロニクス
背景:
- 磁気材料の電気制御は,基本的な磁気とアプリケーションにとって不可欠です.
- 既存の方法は,キャリア群を調節するためのゲート電圧を含むことが多い.
- 磁気秩序パラメータの電気操作のための新しい戦略が必要である.
研究 の 目的:
- Pt/Al/Fe/GaAs001) の多層の磁気特性に対する平面内充電電流の影響を調査する.
- 電流による磁気変化の仕組みを理解する.
- スピントロニックデバイスの 潜在的応用を探るため
主な方法:
- Pt/Al/Fe/GaAsを製造する.
- Pt層における平面内充電電流の適用
- 異なるマイクロ波周波数でのフェロ磁気共振測定
- マグネト・クリスタル・アニソトロピーの電流による変化の分析.
主要な成果:
- Ptの平面内電荷電流は,薄いFe膜にフェロ磁気共振場をシフトさせる.
- このシフトは,Feの磁気結晶アニソトロピー (ΔHA) の電流誘発による変化に起因する.
- ΔHAはFe膜の厚さ,電流の極性,磁化方向に依存し,スピン/軌道蓄積効果と一致する.
- Ptからのスピン電流は,磁気特性を変更する上で主要な役割を果たします.
結論:
- 電流は鉄のフィルムの磁性アニソトロピーを効果的に調節することができます.
- 観測された現象は,スピン電流の生成と磁気層との相互作用に関連しています.
- これは,磁気に対する電気制御を備えた高度なスピントロニックデバイスを開発するための新しい経路を提供します.
関連する概念動画
Principle of Angular Impulse and Momentum
570
The angular impulse and momentum principle provides insights into how forces applied at a distance from an object's rotational axis influence its angular velocity. It builds upon the crucial relationship between the moment of force and angular momentum. By integrating this equation, substituting the limits for the initial and final times, a comprehensive expression representing the angular impulse and momentum principle is derived.
570
Diamagnetism
2.4K
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....
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....
2.4K
Conservation of Angular Momentum
10.2K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Considering a system that consists of n tiny particles, the angular momentum of any tiny particle may change, but the system's total angular momentum would remain constant. The principle of conservation of angular momentum only considers the net external torque acting on the system. While there are internal forces exerted by different particles within the system that also produce...
10.2K
Magnetism
6.3K
Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
6.3K
Angular Momentum: Single Particle
6.1K
Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm...
6.1K
Lenz's Law
3.8K
The direction in which the induced emf drives the current around a wire loop can be found through the negative sign. However, it is usually easier to determine this direction with Lenz's law, named in honor of its discoverer, Heinrich Lenz (1804–1865). Lenz's law states that the direction of the induced emf drives the current around a wire loop always to oppose the change in magnetic flux that causes the emf.
If a bar magnet is moved toward a coil such that the magnetic flux...
If a bar magnet is moved toward a coil such that the magnetic flux...
3.8K

