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01:05Atomic 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...
01:22Magnetic Force On Current-Carrying Wires: Example
In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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.
01:16Magnetic Field Of A Current Loop
Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
01:25Magnetic 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...
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...
01:18Magnetic Field Due to Two Straight Wires
Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Updated: Jul 13, 2026
11:10
Fabrication and Operation of a Nano-Optical Conveyor Belt
Published on: August 26, 2015
横の鉄磁石/半導体構造におけるスピン輸送のイメージング
1National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. crooker@lanl.gov
Science (New York, N.Y.)
|October 1, 2005
まとめ
研究者は,ガリウムアルセニド装置のスピン注入と蓄積を直接イメージした. 彼らは,電子電流に対して流れるスピン偏振を観察し,鉄磁気コンタクトからの反射によるスピン蓄積を示しました.
科学分野:
- 凝縮物質物理学 凝縮物質物理学
- マテリアルサイエンス 材料科学
- スピントロニクス (Spintronics) は,スピントロニクス (Spintronics) を開発したものです.
背景:
- 横向スピン輸送装置は,スピンインジェクションと検出のために鉄磁気コンタクトを使用します.
- スピンダイナミクス,特にスピン蓄積と輸送の理解は,スピントロニックアプリケーションにとって極めて重要です.
研究 の 目的:
- ガリウムアルセニド (GaAs) チャンネルにおける電気スピン注入と蓄積を直接イメージする.
- 鉄磁気排水コンタクトの近くのスピン蓄積の行動と起源を調査する.
- スピンの方向を制御することによって電気伝導性の調節を探求する.
主な方法:
- 横向のスピン輸送装置におけるスピン注入と蓄積の直接イメージング.
- フェロ磁気源と排水トンネル・バリアコンタクトを使用した.
- スピン極化電子の光学注入.
主要な成果:
- 源からのスピン放出を観察し,ドレインの近くのスピン蓄積の領域をイメージしました.
- 注入されたスピンと蓄積されたスピンは,コンタクト磁化に対して反パラレルで,同じ方向性を示した.
- 蓄積されたスピン極化が,電子の純電流に反して,ドレインから流れ去り,反射によるスピン極化を示すことを実証した.
結論:
- 直接イメージングは,横のデバイスのスピンダイナミクスに関する前例のない洞察を提供します.
- スピン蓄積は,鉄磁気ドレインコンタクトでの反射から生じる.
- 電気伝導性は,スピン方向を操作することによって制御され,新しいスピントロニックデバイスの道を開くことができます.