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関連する概念動画

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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Induced Electric Dipoles01:28

Induced Electric Dipoles

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.4K
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

5.0K
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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Diamagnetism01:26

Diamagnetism

2.5K
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....
2.5K
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

470
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
470
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

9.2K
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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動的に誘導された多鉄極化

Carolina Paiva1, Michael Fechner2, Dominik M Juraschek1,3

  • 1Tel Aviv University, School of Physics and Astronomy, Tel Aviv 6997801, Israel.

Physical review letters
|August 27, 2025
PubMed
まとめ

科学者はレーザーパルスを使って 非極性物質に 鉄電極化と磁性化を作り出すことができます この発見により,新しい材料のマルチフェロ性および磁電性特性を超高速で制御することができます.

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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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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy

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関連する実験動画

Last Updated: Sep 10, 2025

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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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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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科学分野:

  • 凝縮物質物理学
  • 材料科学
  • 量子光学

背景:

  • 鉄電極化と磁気化は通常,異なる材料で発見されます.
  • 非極性非磁性材料でマルチフェロ性 (鉄電性と磁性の共存) を達成することは大きな課題です.
  • これらの特性を超高速で制御することは 活発な研究分野です

研究 の 目的:

  • 非極性,非磁性材料における鉄電極化および磁化誘導のための新しいメカニズムを記述する.
  • 超短時間のレーザーパルスを使って,これらの特性の一時的な誘導を証明する.
  • レーザーパルスキラリティとフォノンモードによるマルチフェロア極化の制御を調査する.

主な方法:

  • 現象学的モデリング
  • 最初の原則の計算
  • ガンマ-リチウムボラート (γ-LiBO2) でフォノンモードの超高速レーザー刺激

主要な成果:

  • γ-LiBO2でフェロ電極化,磁気化,または両方の一時的誘導が実証されている.
  • 誘導された極化と磁化は,レーザーパルスの極化 (線形,円形,円形) とキラリティに依存することを示した.
  • マルチフェロア極化の方向と大きさは,レーザーキラリティとフォノンモードによって調節することができる.

結論:

  • 非極性物質の多鉄性および磁電性を生成し制御するための新しい経路が確立されました.
  • 超高速レーザーパルスは,磁気と電気の極化を動的に制御するための有望な方法を提供します.
  • この研究は,超高速のスイッチング機能を備えた新しいマルチフェロイドデバイスの開発への道を開きます.