通过电子捐赠和提取组的吸附调节2D多铁单层中的过渡温度和磁性异构性
Chee Kian Yap1, Lei Zhang2, Aijun Du1
1School of Chemistry and Physics, Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia.
概括
将二维磁性CrSe2与NO2和NH2组功能化,可以提高其过渡温度和磁性异构性. 这为先进的自旋电子和磁电纳米设备创造了一个有前途的平台.
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
- 纳米技术 纳米技术
背景情况:
- 二维 (2D) 磁性材料对于下一代磁电纳米设备和自旋电子技术至关重要.
- 目前的局限性包括缺乏具有高过渡温度和较大的磁性异构性材料.
- CrSe2单层为探索这些特性提供了一个潜在的平台.
研究的目的:
- 研究功能化对CrSe2单层磁性和电子性能的影响.
- 探索功能化CrSe2在旋转子应用中的潜力.
主要方法:
- 使用第一原则计算来研究功能化的CrSe2单层.
- 电子捐赠 (NH2) 和电子提取 (NO2) 组被用于功能化.
- 进行了磁性基态,过渡温度,磁性异性质能量 (MAE) 和电极化的分析.
主要成果:
- 功能化改变了CrSe2的磁性基态,从反铁磁变为铁磁.
- 过渡温度被提升到105K (CrSe2-NO2) 和70K (CrSe2-NH2).
- 由于NO2的电子吸收效应,CrSe2-NO2的磁性异性能量 (MAE) 显著增加.
- 在功能化的单层中诱导了强大的外平面电极化.
结论:
- 功能组在调整二维多铁材料的磁性和电子性质方面发挥着至关重要的作用.
- 功能化的CrSe2为开发二维自旋电子设备提供了可控制的方法.
- 这项研究为设计先进的二维磁性材料提供了总体策略.
更多相关视频
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
7.6K
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.0K
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
01:28Types Of Superconductors
897
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...
897
01:30Paramagnetism
2.5K
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...
2.5K
03:02Colors and Magnetism
11.4K
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...
11.4K
01:31Magnetic Susceptibility and Permeability
877
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
877
01:27π Electron Effects on Chemical Shift: Overview
1.0K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.0K