関連する実験動画
Updated: Jun 26, 2026
10:52
Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
ショットキーダイオードで超高速で磁場を生成する
Y Acremann1, M Buess, C H Back
1Laboratorium für Festkörperphysik, Eidgenössische Technische Hochschule Zürich, CH-8093 Zürich, Switzerland.
Nature
|November 2, 2001
まとめ
研究者らは,ショットキーダイオードの光学ポンプを使用して超高速磁場生成のための新しい方法を開発しました. この技術は,高度なデータストレージアプリケーションのローカル磁場を正確に制御することを可能にします.
科学分野:
- マテリアルサイエンス 材料科学
- 凝縮物質物理学 凝縮物質物理学
- ナノテクノロジー ナノテクノロジー
背景:
- 超高速の局所磁場生成は,次世代の磁気データストレージに不可欠です.
- 現在の方法は,マイクロコイル,マイクロストリップライン,または電子ビームを伴うもので,スピン極化電流が有望であることを示しています.
研究 の 目的:
- ハイブリッドの鉄磁性半導体構造で超高速ローカル磁場生成のための新しいスキームを導入する.
- 効率的な磁場制御のために,ショットキーダイオードの光学ポンプを活用する.
主な方法:
- Schottkyダイオードを光学的にポンプし, ~150-fsのレーザーパルスに焦点を当てます.
- 半導体と金属の交差点を通って光学刺激によって電流を生成する.
- 発生した電流から平面内磁場を生成する.
主要な成果:
- 局所電流注入とショットキーの障壁速度を組み合わせた方法を実証した.
- 飛行機内の任意の方向でローカルフィールドの急速な作成を達成しました.
- ダイオードバイアス電圧による磁場大きさの調節性を示した.
結論:
- 提案された光学ポンプスキームは,超高速の局所磁場生成のための多用途で効率的なアプローチを提供します.
- このテクニックは,磁気データストレージ技術の進歩に重大な影響を及ぼします.
- 磁場をスキャンして調節する能力は,磁気要素を操作するための新しい可能性を提示します.
関連する概念動画
01:27Magnetic 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...
A magnetic field is defined by the force that a charged particle experiences...
01:17Force On A Current Loop In A Magnetic Field
Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
01:27Magnetic Field Due To A Thin Straight Wire
Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
01:23Faraday Disk Dynamo
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01:24Energy In A Magnetic Field
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The energy...
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The energy...
01:23Magnetic Field due to Moving Charges
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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