相关概念视频
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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相关实验视频
Updated: Jul 13, 2026
11:10
Fabrication and Operation of a Nano-Optical Conveyor Belt
Published on: August 26, 2015
在横向铁磁铁/半导体结构中成像自旋传输.
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
概括
研究人员直接对氧化装置中的旋转注入和积累进行了成像. 他们观察到与电子电流相流的自旋极化,显示通过铁磁接触的反射通过自旋积累.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 这就是Spintronics.
背景情况:
- 侧向旋转传输装置使用铁磁接触器进行旋转注入和检测.
- 了解旋转动力学,特别是旋转积累和运输,对于旋转电子应用至关重要.
研究的目的:
- 为了直接对化 (GaAs) 通道中的电旋注入和积累进行成像.
- 为了研究铁磁排水接口附近的旋转积累的行为和起源.
- 通过控制旋转方向来探索电导率的调制.
主要方法:
- 在侧向旋转传输装置中直接成像旋转注入和积累.
- 使用铁磁源和排水道-屏障接触.
- 旋极极化电子的光学注入.
主要成果:
- 从源头观察到旋转的发射,并对排水附近的旋转积累区域进行成像.
- 注射和积累的旋转表现出相同的方向,与接触磁化相反.
- 证明积累的自旋极化流离离排水,与净电子电流相对应,表明通过反射的自旋极化.
结论:
