在Fe/Bi_{2}Te_{3}异构结构中的不同时间尺度的扭曲效应诱导的旋转电流吸收
Jia-Nan Liu1,2, Hao-Pu Xue1,2, Zhuo Deng1,2
1Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China.
Physical review letters
|June 27, 2025
概括
在铁磁铁/拓绝缘体 (TI) 异构结构中的旋转送显示了由于扭曲的拓表面状态而导致的异构旋转电流吸收. 这种扭曲影响着吉尔伯特减压和超快速去磁,为先进的自旋电子设备铺平了道路.
科学领域:
- 这就是Spintronics.
- 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
背景情况:
- 在铁磁/非磁 (FM/NM) 异构结构中的旋转送注入了旋转电流,使得超快,低功率的旋转电子设备成为可能.
- 高级k·p理论术语在拓绝缘体 (TI) 中诱导了显著的费米轮曲线.
- 扭曲拓表面状态 (TSS) 对FM/TI异构结构中旋转电流吸收的影响仍然未被探索.
研究的目的:
- 研究扭曲TSS对FM/TI异构结构中纯自旋电流吸收的影响.
- 在具有显著扭曲的FM/TI系统中确定异型旋转电流吸收的机制.
- 探索曲线对吉尔伯特减压和超快脱磁动态的影响.
主要方法:
- 考虑旋转积累强度的理论建模,以确定异型旋转电流吸收机制.
- 在Bi2Te3膜中分析状态密度 (DOS) 和散装状态贡献.
- 使用铁磁共振 (FMR) 和时间解析磁光克尔效应 (TRMOKE) 的实验验证.
主要成果:
- 确定了具有很大的扭曲效应的FM / TI异构结构中异型自旋电流吸收的机制.
- 当TSS主导费米表面时,扭曲会导致异性质的吉尔伯特阻尼 (纳秒时间尺度) 和近同性质的超快去磁化 (femtosecond时间尺度).
- 在更厚的Bi2Te3膜中,随着散装状态贡献的增加,吉尔伯特阻尼异构性会降低.
结论:
- 在Fe/Bi2Te3异构结构中,理论上对曲诱导的旋转电流吸收的预测得到了实验证实.
- 该研究提供了对FM/TI系统中旋转转移机制的更清晰的理解.
- 这项工作为发展异型自旋电子学提供了基础.
相关概念视频
Biasing of Metal-Semiconductor Junctions
339
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
339
Spin–Spin Coupling Constant: Overview
1.0K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.0K
NMR Spectroscopy: Spin–Spin Coupling
1.6K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
1.6K
Biasing of FET
372
Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
372
Atomic Nuclei: Nuclear Spin State Overview
1.1K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
1.1K
Atomic Nuclei: Nuclear Relaxation Processes
728
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
728


