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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

8.9K
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...
8.9K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.5K
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...
28.5K
Colors and Magnetism03:02

Colors and Magnetism

12.1K
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...
12.1K
Ferromagnetism01:31

Ferromagnetism

2.8K
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...
2.8K
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

2.9K
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...
2.9K
Magnetic Damping01:17

Magnetic Damping

1.3K
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
1.3K

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関連する実験動画

Updated: May 5, 2026

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
07:03

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

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マルチフェロ性六角性マンガニートの巨大な磁気弾性結合.

Seongsu Lee1, A Pirogov, Misun Kang

  • 1Department of Physics, SungKyunKwan University, Suwon 440-746, Korea.

Nature
|February 15, 2008
PubMed
まとめ

六角形のマンガナイトは,同構造の移行中に異常に大きな原子の移位を示し,重要な磁気弾性結合を明らかにします. この発見は,それらの磁気-電気的性質を理解するための鍵です.

さらに関連する動画

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
06:49

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

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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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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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関連する実験動画

Last Updated: May 5, 2026

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
07:03

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
06:49

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

Published on: April 12, 2019

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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科学分野:

  • 固体物理学 固体物理学とは
  • マテリアルサイエンス 材料科学
  • クリスタログラフィーです.

背景:

  • 固体における原子運動は,空間群対称性によって決定され,電子構造と物理的性質に影響する.
  • 原子の位移と温度を比較する実験的観測は,典型的には微小な位移があるため稀である.
  • 原子の位置とダイナミクスを理解することは,固体物理学の基本です.

研究 の 目的:

  • 温度変化中に六角形マンガニート (RMnO3) の原子移位を調査する.
  • これらの材料における原子の移動の性質と大きさを特徴づける.
  • 原子運動,磁気弾性結合,磁気電気現象の関係を探求する.

主な方法:

  • 原子の位置を正確に測定するために, difraktion 技術の組み合わせを使用しました.
  • 単元細胞内のすべての原子の原子位移を温度に応じて追跡した.
  • 実験結果と,グループ理論から得られた理論的予測を比較した.

主要な成果:

  • 六角マングナイト (RMnO3) は,他の磁性材料よりも2桁の大きさの例外的に大きな原子の移位を特徴とする同構造的移行を経験します.
  • これらの大きな原子の移転から生じる異常に強い磁気弾性結合を示した.
  • 実験的な原子移位データとグループ理論に基づく予測の間の一貫性を観察した.

結論:

  • 六角形のマンガナイトにおける巨大な磁気弾性結合は,それらの巨大で温度によって引き起こされる原子の移転の直接的な結果である.
  • この強いカップリングは,最近観測されたRMnO3.3における磁電効果の根本的な要因として特定されています.
  • この発見は,磁性材料の構造-特性関係に関する新しい視点を提供しています.