磁性结构依赖的旋转纹理 六边形MnFeCoGe磁铁中的格子
Jiawang Xu1, Lei Xi1, Shouyuan Xing1
1Anhui Provincial Key Laboratory of Magnetic Functional Materials and Devices, School of Materials Science and Engineering, Anhui University, Hefei, Anhui 230601, China.
ACS nano
|August 21, 2024
概括
研究人员在MnFeCoGe磁铁中将混乱的磁域转化为有序的条纹域. 他们实现了强大的II型磁气泡网格,为设计先进的自旋电子设备提供了新的策略.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 磁力学 磁力学 是一种
背景情况:
- 拓旋转纹理对于先进的磁性信息存储和旋转电子技术至关重要.
- 这些纹理提供高存储密度和低能耗.
- 了解它们的形成和操纵是开发下一代设备的关键.
研究的目的:
- 为了研究磁体配置在MnFe$_{1-x}$Co$_x$Ge.Ge中的转换.
- 探索创建稳定,高密度的拓旋转纹理.
- 建立设计新型自旋电子材料的策略.
主要方法:
- 合成和表征MnFe$_{1-x}$Co$_x$Ge合金的不同含量.
- 中子衍射和洛伦兹传输电子显微镜 (L-TEM) 用于磁结构分析.
- 外平面磁场刺激和场冷却以诱导泡格子.
- 微磁模拟以确认磁相互作用.
主要成果:
- 观察到从迷宫转变为条纹磁域的变化,其中含有越来越多的.
- 确定了从非对线性到单轴性铁磁结构的过渡.
- 成功建立了一个六角格子,由坚固的II型磁气泡组成,价格为$x=0.8$.
- 证明了泡尺寸可以根据样品厚度调整.
结论:
- 在MnFe$_{1-x}$Co$_x$Ge中的磁性结构操纵稳定了复杂的拓旋转纹理.
- 增强的单轴铁磁和双极双极相互作用是这种稳定性的关键.
- 这为设计用于spintronic应用的拓旋转纹理提供了一个有效的策略.
更多相关视频
08:55Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
8.5K
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.1K
相关概念视频
03:02Colors and Magnetism
11.6K
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...
11.6K
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
01:03Atomic Nuclei: Nuclear Spin State Overview
903
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...
903
00:59Atomic Nuclei: Nuclear Magnetic Moment
1.1K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
1.1K
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
02:42Valence 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