原子级磁力是通过在拓绝缘体表面嵌入共原子来实现的
Dmitry A Muzychenko1, Asteriona-Maria Netsou2, Koen Schouteden3
1Faculty of Physics, Lomonosov Moscow State University, Moscow 119991, Russia.
ACS nano
|March 6, 2026
概括
这项研究探讨了使用原子的多拓绝缘体,创造局部磁性状态. 这种方法为量子应用提供了一种控制磁性的途径,而不会破坏材料的绝缘性能.
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
- 量子现象是一种量子现象.
背景情况:
- 拓绝缘器 (TI) 具有独特的表面状态 (TSSs),使其具有奇特的电子特性.
- 对像拓磁电效应这样的现象来说,TI的磁性兴奋剂至关重要,但在原子尺度上理解得很少.
- 在信息技术中,打破时间逆向对称 (TRS) 对先进的量子应用至关重要.
研究的目的:
- 在Bi2Te3的拓绝缘体中研究由 (Co) 兴奋剂诱导的原子级磁性.
- 了解合并的机制及其对电子和磁性特性的影响.
- 探索实现磁性秩序的策略,同时保持量子应用的散装绝缘特性.
主要方法:
- 利用扫描道显微镜/光谱 (STM/STS) 进行原子尺度成像和电子表征.
- 在Bi2Te3表面上使用的单原子沉积.
- 执行密度函数理论 (DFT) 计算,以建模Co的结合和磁相互作用.
主要成果:
- 证明了Bi2Te3的第二个原子层中的Bi位点上的Co原子的替代性兴奋剂.
- 由于p-d轨道杂交,观察到自旋极化电子配置具有显著的平面外磁矩.
- 发现了Co原子的优先聚类,并揭示了相邻的Co dopants之间的铁磁 (FM) 合.
结论:
- 第二个原子层的地下兴奋剂提供了一条诱导磁性的途径,而不会损害散装TI特性.
- 控制的协同兴奋剂可以导致局部磁性状态和潜在的远程FM订单.
- 这种方法为实现量子异常霍尔状态的磁拓材料提供了批量兴奋剂的替代方案.
更多相关视频
07:42Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
Published on: July 20, 2022
3.4K
06:49Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
Published on: April 12, 2019
8.2K
相关概念视频
Ferromagnetism
3.3K
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...
3.3K
Colors and Magnetism
14.4K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.4K
Types Of Superconductors
1.7K
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
1.7K
Valence Bond Theory
11.4K
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...
11.4K
Diamagnetism
3.1K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
3.1K
Potential Due to a Magnetized Object
847
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
The vector...
847
