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Ferromagnetism01:31

Ferromagnetism

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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...
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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
18.3K
Colors and Magnetism03:02

Colors and Magnetism

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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...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.2K
Ionic Crystal Structures02:42

Ionic Crystal Structures

15.5K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
15.5K
Valence Bond Theory02:42

Valence Bond Theory

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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...
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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铁电不相称的自旋晶体

Dorin Rusu1, Jonathan J P Peters1,2, Thomas P A Hase1

  • 1Department of Physics, University of Warwick, Coventry, UK.

Nature
|February 10, 2022
PubMed
概括

研究人员在酸层中观察到新的铁电, 形成了一个不相称的极性晶体. 这一发现提供了磁自旋晶体的电模拟,并模糊了铁电和铁磁拓之间的界限.

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科学领域:

  • 凝聚物质物理
  • 材料科学
  • 铁电和铁磁

背景情况:

  • 铁子,特别是铁磁体,在特定条件下表现出复杂的拓结构,如和.
  • 铁电系统,如PbTiO3/SrTiO3超级网格,显示了类似的电偶极结构.
  • 由Dzyaloshinskii-Moriya相互作用驱动的磁旋网的电双极等价值还没有在实验中实现.

研究的目的:

  • 在SrRuO3电极之间插入的单个PbTiO3表轴层中研究域结构.
  • 通过实验观察和描述新的铁电拓结构.
  • 为了探索磁性Dzyaloshinskii-Moriya相互作用驱动的相的铁电模拟.

主要方法:

  • 使用SrRuO3电极对单个PbTiO3表层进行实验检查.
  • 对周期性铁电的观察.
  • 理论计算以支持观察到的拓.

主要成果:

  • 观察周期性的时针方向和反时针方向的铁电.
  • 发现了沿着旋核心的二次排序, 创造了一个迷宫般的模式.
  • 形成一个不相称的极性晶体,具有两个直角周期调制.
  • 观察到的结构是铁磁体中不相称的自旋晶体的铁电模拟.

结论:

  • 这项研究揭示了铁电PbTiO3中的一种新型不相称的极性晶体,类似于磁自旋晶体.
  • 这些发现模糊了新出现的铁磁和铁电拓之间的区别.
  • 这些结果为实现磁性Dzyaloshinskii-Moriya相互作用驱动的电相铺平了道路.