表面声波驱动铁磁共振的直流电流检测
Chong Chen1, Lei Han1, Peisen Liu1
1Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|June 12, 2023
概括
研究人员开发了一种新的方法来测量使用表面声波 (SAW) 和电直电的自旋声波合. 这种技术有效地描述了SAW驱动铁磁共振 (FMR) 设备中的有效场.
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:
- 表面声波 (SAW) 被探索为旋-声波合研究.
- SAW驱动的铁磁共振 (FMR) 能够进行声学旋转操纵.
- 在FMR中精确地描述SAW诱导的有效场是具有挑战性的.
研究的目的:
- 开发SAW驱动FMR的直流检测方法.
- 用电直化来表征和提取有效场.
- 探索旋转声电子设备的潜力.
主要方法:
- 铁磁条带与SAW设备的整合.
- 用于SAW驱动FMR的直流检测的电直化.
- 分析FMR纠正电压以提取有效场.
主要成果:
- 展示了一种用于简单地描述有效场的新方法.
- 该技术提供了更好的集成兼容性和比传统方法更低的成本.
- 实现了大量的非互惠整正电压,可通过应变控制进行调节.
结论:
- 开发的方法提供了一种方便且具有成本效益的方法来研究旋声声合.
- 这些发现突出了可调节自旋声电子设备和电开关的潜力.
- 这项工作为旋转动态的声学操纵提供了基本的见解.
相关概念视频
01:31Ferromagnetism
2.4K
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...
2.4K
01:18Magnetic Field Due to Two Straight Wires
2.7K
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.
2.7K
01:28Magnetic Field Due To A Thin Straight Wire
4.9K
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.
4.9K
01:17Magnetic Damping
505
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
505
01:22Magnetic Force On Current-Carrying Wires: Example
1.5K
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.
1.5K
01:16Magnetic Field Of A Current Loop
4.7K
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.
4.7K