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Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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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...
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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...
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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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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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From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
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Equivalent Capacitance01:19

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Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
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マルチドメインの鉄電超網における負の電容

Pavlo Zubko1, Jacek C Wojdeł2, Marios Hadjimichael1

  • 1London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, 17-19 Gordon Street, London WC1H 0HA, UK.

Nature
|June 15, 2016
PubMed
まとめ

超電網のドメイン壁は負の電容性を可能にします これは高度な電子機器にとって重要な現象です この研究は,ドメインの動きが負の伝導性を強化し,フィールド効果トランジスタの限界を克服することを示しています.

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科学分野:

  • 材料科学
  • 凝縮物質物理学
  • ナノテクノロジー

背景:

  • メモリ装置などの用途に不可欠な自発的な電極化を示します.
  • ナノスケールフェロエレクトリックは 大量材料とは異なる独特の振る舞いを示し,新しいデバイスの可能性を秘めています.
  • 薄型フェロエレクトリックの安定した偏振は困難ですが,不安定化は負の許容性と負の電容性につながる可能性があります.

研究 の 目的:

  • マルチドメインの鉄電離超電網における負の電容性を調査する.
  • ドメイン形成とドメイン壁運動が負の電容性を達成する上で果たす役割を理解する.
  • フィールド・エフェクト・トランジスタにおける電力消費の限界を克服するための負の容量の可能性を調査する.

主な方法:

  • 温度範囲にわたる鉄電離子超網の実験研究.
  • 負の許容性を説明する現象学的モデルの開発.
  • 顕微鏡の洞察のための第一原理に基づく原子的シミュレーション

主要な成果:

  • マルチドメインのフェロ電気-ダイエレクトリック・スーパーグリットで負の電容性を証明した.
  • 領域壁の運動が負の許容性であることを示した.
  • 領域の動きが 負の許容性の温度範囲を高めることがわかりました

結論:

  • フェロ電気超格子におけるドメイン壁の動きは,負の電容性を達成するための実行可能なメカニズムである.
  • 観測された現象では,近接層が支配的な役割を果たしています.
  • この研究は,将来の電子機器の負の電容性を利用するための道を開きます.