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関連する概念動画

Ferromagnetism01:31

Ferromagnetism

2.7K
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...
2.7K
Paramagnetism01:30

Paramagnetism

2.8K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.8K
Types Of Superconductors01:28

Types Of Superconductors

1.4K
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
1.4K
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

1.4K
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
1.4K
Diamagnetism01:26

Diamagnetism

2.7K
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....
2.7K
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

1.8K
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...
1.8K

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関連する実験動画

Updated: Nov 9, 2025

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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原子的に設計されたフェロー層は,室温の磁気電気マルチフェローを生成します.

Julia A Mundy1, Charles M Brooks2, Megan E Holtz1

  • 1School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA.

Nature
|September 23, 2016
PubMed
まとめ

研究者らは,単相マルチフェロ材料を組み合わせたフェロ電気と,室温近くの強い磁力を持つ新しい方法を開発し,高度なメモリデバイスの磁力の電気フィールド制御を可能にしました.

さらに関連する動画

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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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

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関連する実験動画

Last Updated: Nov 9, 2025

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

9.0K
A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

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科学分野:

  • 凝縮物質物理学
  • 材料科学
  • 固体化学

背景:

  • マルチフェロイド材料は 電気と磁気の並べ替えを 同時に行うことで 次世代のメモリデバイスの 鍵となるものです
  • 既知の単相マルチフェロは,競合するフェロ電気および磁気要求により希少であり,しばしば弱い磁気性または低い動作温度を示します.

研究 の 目的:

  • 単相マルチフェロ材料の構築のための新しい方法論を提示する.
  • 潜在的デバイスの磁場制御を可能にします.

主な方法:

  • 六角形のLuFeO3マトリックスにFeO単層を挿入することによって (LuFeO3) m/LuFe2O4) 1のスーパーグリットを合成する.
  • 鉄磁気LuFe2O4層に鉄電性を誘導するために,幾何学的な鉄電性のLuFeO3の平面的な振動を利用する.
  • エピタキシアル工学を用いて 格子歪みを利用する

主要な成果:

  • 単相マルチフェロ材料を部屋温度の近くで結合した鉄磁気と鉄磁気で作りました.
  • LuFe2O4の磁気移行温度を240Kから281Kに上昇させた.
  • 200Kの磁場を直接制御することが示された.

結論:

  • 開発された方法論により,より高温の磁気電気マルチフェロイドの設計が可能になります.
  • このアプローチは,新しい材料の特性のために,幾何学的挫折,格子歪み,および表軸工学を組み合わせています.
  • この発見は,電場調節可能な磁気を持つ高度な記憶装置の道を開く.