从一个隔热反铁磁体抽出子特拉赫兹旋转
在PubMed上查看摘要
概括
此摘要是机器生成的。研究人员观察到反铁磁体与绝缘体之间的反特拉赫兹旋转. 逆自旋霍尔效应电压取决于激发
科学领域
- 机器人
- 凝聚物质物理学
- 抗铁磁性
背景情况
- 旋转转矩和旋转霍尔效应是关键的旋转现象.
- 在反铁磁装置中直接观察这些效应是具有挑战性的.
研究的目的
- 在反铁磁绝缘体接口上研究旋转和反旋转霍尔效应 (ISHEs).
- 通过循环极化辐射来探索自旋电流的控制.
主要方法
- 在二 (一种反铁磁体) 和的接口上利用了亚特拉赫兹旋转.
- 在中测量了由旋电荷转换产生的ISHE电压.
- 采用循环极化子特拉赫兹辐射来激发和调节反铁磁动态模式.
主要成果
- 在MnF2/Pt接口上成功观察了亚特拉赫兹旋转.
- 证明测量的ISHE电压取决于反铁磁动态的性.
- 通过辐射的手性来显示这些模式的选择性激发和调节.
结论
- 这项工作提供了对抗铁磁体中自旋的直接证据.
- 这些结果突出了控制特拉赫兹频率的纯自旋电流的潜力.
- 开辟了利用反铁磁动力学的新型旋转应用的途径.
相关概念视频
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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 one, the...
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.
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
Here, ΔE is the energy difference between the states, k is the Boltzmann...
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...
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...

