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関連する概念動画

Magnetic Fields01:27

Magnetic Fields

7.9K
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
7.9K
Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

6.7K
Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
6.7K
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

7.0K
Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
7.0K
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

12.4K
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...
12.4K
Ferromagnetism01:31

Ferromagnetism

3.5K
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...
3.5K
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

5.4K
Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
5.4K

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関連する実験動画

Updated: Apr 5, 2026

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
12:20

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 6, 2013

15.2K

連続的に調節可能なランダムなフィールド内のフェロマグネット.

D M Silevitch1, D Bitko, J Brooke

  • 1The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA.

Nature
|August 3, 2007
PubMed
まとめ

不規則な磁石は,キュリー温度を超えた単一の磁気反応を示し,これはT(C) で異常な分岐をします. この発見は,ランダムフィールド問題の理解を前進させ,アプリケーションのドメインウォールピニングの洞察を提供します.

科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • マテリアルサイエンス 材料科学
  • マグネティズム (磁気) とは

背景:

  • ほとんどの物理系は乱れているが,理論モデルでは乱れを軽微な乱れとして扱うことが多い.
  • キュリー温度 (T ((C)) の近くのフェロマグネットは,ランダムな化学置換で通常抑制された重要な振る舞いを示します.
  • 乱れたフェロマグネットにおける大量測定は,通常,重大な乱れレベルを下回る質的に新しい現象を明らかにしません.

研究 の 目的:

  • モデルの乱れた磁石の磁気反応を調査する.
  • 乱れた磁気系における新しい現象を特定する.
  • 基礎物理学と技術応用への影響を調査する.

主な方法:

  • 乱れた磁気システムのモデルを研究する.
  • 磁気反応,特に感受性を測定する.
  • 外部磁場を磁化方向に横切って適用する.

主要な成果:

  • キュリー温度 (T (C)) 以上で単一の磁気反応が観察されました.
  • この特異性は,T ((C)) の正確さで異常な分岐を示した.
  • 応答は,横断外磁場によって誘発されたランダムな内部フィールドから発生します.

さらに関連する動画

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

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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

Published on: March 24, 2019

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関連する実験動画

Last Updated: Apr 5, 2026

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
12:20

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 6, 2013

15.2K
Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
08:25

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

Published on: July 3, 2015

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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

Published on: March 24, 2019

8.7K

結論:

  • 乱れた磁石は,キュリー温度の近くでユニークな行動を示します.
  • 観測された現象は,磁気システムのランダムフィールド効果と関連しています.
  • 発見は,磁気アプリケーションに不可欠なドメインの壁ピニングのチューニングの可能性を示唆しています.