在拓Weyl半金属TaIrTe4中具有很大的外平面旋转轨道扭矩
Lakhan Bainsla1,2, Bing Zhao3, Nilamani Behera4
1Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296, Göteborg, Sweden. lakhan.bainsla@iitrpr.ac.in.
Nature communications
|May 31, 2024
概括
拓量子材料为高效的磁切换提供独特的自旋电流. 这项研究表明,使用TaIrTe4的外平面旋转轨道扭矩 (SOT) 很大,其效率比其他材料高出一个数量级.
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
- 量子材料是一种量子材料.
背景情况:
- 拓量子材料具有独特的电子特性,如受保护的表面状态.
- 这些特性对于产生外平面自旋极化电流对于磁性切换至关重要.
- 传统的旋转轨道扭矩 (SOT) 材料和较低晶体对称性的材料在产生高效的外平面电流方面存在局限性.
研究的目的:
- 用拓量子材料演示高效的外部无磁场磁化切换.
- 研究TaIrTe4的潜力,作为一种产生大型外平面阻尼性SOT的材料.
- 为了探索节能SOT应用.
主要方法:
- 铁4/Ni80Fe20异构结构的制造.
- 旋转扭矩铁磁共振 (STFMR) 的测量.
- 第二和的霍尔测量.
主要成果:
- 通过使用TaIrTe4.4在室温下演示出一种大型的外平面减压类SOT.
- 在TaIrTe4/Ni80Fe20异构结构中观察到显著大的外平面SOT效率.
- 估计的外平面旋转霍尔导电率为 (4.05 ± 0.23) ×10^4 (ħ/2e) (Ωm) ^-1,比之前报告的数值高出一个数量级.
结论:
- 泰尔Te4是一个拓Weyl半金属候选物,对SOT应用具有很好的潜力.
- 该材料的独特特性使得高效的外平面旋转电流产生成为可能.
- 这项研究为开发下一代节能型自旋电子设备铺平了道路.
相关概念视频
Spin–Spin Coupling Constant: Overview
909
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...
909
Spin–Spin Coupling: One-Bond Coupling
957
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
957
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
999
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
999
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
1.1K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
1.1K
Valence Bond Theory
8.5K
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...
8.5K
Gyroscope
2.9K
A gyroscope is defined as a spinning disk in which the axis of rotation is free to assume any orientation. When spinning, the orientation of the spin axis is unaffected by the orientation of the body that encloses it. The body or vehicle enclosing the gyroscope can be moved from place to place, while the orientation of the spin axis remains the same. This makes gyroscopes very useful in navigation, especially where magnetic compasses cannot be used, such as in crewed and crewless spacecraft,...
2.9K


