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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

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...
Ferromagnetism01:31

Ferromagnetism

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...
Colors and Magnetism03:02

Colors and Magnetism

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 eye.
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
MOS Capacitor01:25

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...

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関連する実験動画

Updated: May 18, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

スピンフロップスイッチングと,分子導体内のメモリ.

Mitsuhiko Maesato1, Tomohito Kawashima, Yoshitomo Furushima

  • 1Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan. maesato@kuchem.kyoto-u.ac.jp

Journal of the American Chemical Society
|October 9, 2012
PubMed
まとめ

私たちは,新しい分子導体において,有意な正の磁気抵抗と非揮発性記憶を観察しました. これは,π電子とd電子のスピンの相互作用から生じ,分子スピントロニクスへの道を開く.

さらに関連する動画

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
09:49

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx

Published on: May 13, 2020

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

関連する実験動画

Last Updated: May 18, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
09:49

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx

Published on: May 13, 2020

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

科学分野:

  • 材料科学 材料科学とは
  • 凝縮物質物理学 凝縮物質物理学
  • 分子電子 (モレキュラー・エレクトロニクス)

背景:

  • 分子伝導体は,調節可能な電子特性を提供します.
  • 異なる電子系 (π と d) の相互作用は,新しい現象の鍵です.
  • 反鉄磁気配列とスピン密度波は,重要な電子状態である.

研究 の 目的:

  • π-dハイブリッド分子導体の磁気伝送特性を調査する.
  • 観測された磁気抵抗と記憶効果の起源を探求する.
  • スピントロニクスにおける分子システムの可能性を実証する.

主な方法:

  • π-dハイブリッド分子導体 (DIETSe) 2FeCl4.4.の合成について
  • 変数磁場下での電気輸送測定. 変数磁場の下での電気輸送測定.
  • スピンオーダーリングに関連する磁力輸送現象の分析.

主要な成果:

  • 100%までのスピンフロップ誘発の陽性磁気抵抗を初めて観測した.
  • 非揮発性磁気抵抗性記憶効果の実証.
  • スピン密度波 (SDW) と反鉄磁性d電子の並存の証拠.

結論:

  • 観測された現象は,Q1D π電子の不安定性とd電子の反鉄磁性との相互作用から生じる.
  • この発見は,分子スピントロニクスとメモリデバイスのための新しい道を開く.
  • (DIETSe) 2FeCl4システムは,結合された電子と磁気の秩序を研究するためのモデルとして機能します.