在范德瓦尔斯的反铁磁CuCr1-FeP2S6中调节磁电和极性
Yu Xing1, Haoshen Ye1, Guowei Du2
1Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 211189, China. linglongli@seu.edu.cn.
Nanoscale horizons
|February 11, 2025
概括
在2D范德瓦尔斯CuCrP2S6中对铁进行注,可以保持反铁磁性,并在低度下揭示磁电合和第二波生成效应,为新型多铁材料铺平了道路.
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
- 固态化学 固态化学
背景情况:
- 多铁体中的磁电合在氧化物中得到了很好的研究,但在二维范德瓦尔斯材料中未得到充分研究.
- CrP2S6 (CCPS) 具有内在的抗铁磁 (AFM) 和抗铁电 (AFE) 特性,使其成为2D多铁体的候选者.
- 有限的研究存在于CCPS中的磁电合以及兴奋剂对其磁性行为的影响.
研究的目的:
- 使用化学蒸汽传输 (CVT) 来合成铁合的CuCr1-xFexP2S6 (CCFPS).
- 调查铁剂对CCFPS磁性和非线性光学性能的影响.
- 探索磁电合和二次波生成 (SHG) 在杂系统中.
主要方法:
- 化学蒸汽传输 (CVT) 合成CuCr1-xFexP2S6样本.
- 测量磁性特性以确定尼尔温度 (TN) 和兴奋剂效应.
- 分析磁交换相互作用的第一原则计算.
- 非线性光学测量,包括第二波生成 (SHG).
主要成果:
- 抗铁磁 (AFM) 状态是根据铁兴奋剂度而变化的尼尔温度 (TN) 维持的.
- 在X<0.5.5的兴奋剂度下观察到磁电离合和第二波生成 (SHG) 效应.
- 在较高的兴奋剂水平 (x >= 0.5) 时,这些影响是不存在的.
- 在SHG中奇偶依赖表明了层间对称性破坏的合.
结论:
- 在CCPS中使用铁剂可以保持AFM状态,同时修改磁性,并引入磁电合.
- 观察到的SHG及其奇偶依赖性突出显示了设计具有可调节性质的2D多铁材料的潜力.
- 这些发现有助于理解2D范德瓦尔斯系统中的磁电合,并指导未来的材料设计.
更多相关视频
07:03Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
8.7K
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
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
03:02Colors and Magnetism
11.5K
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...
11.5K
01:26Diamagnetism
2.4K
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....
2.4K
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
01:31Magnetic Susceptibility and Permeability
934
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...
934
01:31Dielectric Polarization in a Capacitor
4.6K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.6K