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関連する概念動画

Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
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...
Magnetic Fields01:27

Magnetic Fields

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...
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

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.
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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.
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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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関連する実験動画

Updated: Jul 7, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact
06:53

Scanning SQUID Study of Vortex Manipulation by Local Contact

Published on: February 1, 2017

プレセッショナル磁気化の逆転における最小のフィールド強度.

Back1, Allenspach, Weber

  • 1Laboratorium fur Festkorperphysik, ETH Zurich, CH-8093 Zurich, Switzerland. IBM Research Division, Zurich Research Laboratory, CH-8803 Ruschlikon, Switzerland. IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA.

Science (New York, N.Y.)
|August 7, 1999
PubMed
まとめ

超高速の磁場パルスはコバルトフィルムの磁化を逆転させることができる. この発見は,より速い磁気記録技術への道を開く.

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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

Published on: January 3, 2018

関連する実験動画

Last Updated: Jul 7, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact
06:53

Scanning SQUID Study of Vortex Manipulation by Local Contact

Published on: February 1, 2017

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
09:43

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Published on: November 7, 2017

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
09:38

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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

背景:

  • マグネチゼーションの逆転は,磁気データストレージに不可欠です.
  • 超高速タイムスケールでの磁気化ダイナミクスを制御することは,継続的な課題です.

研究 の 目的:

  • ピコ秒磁場パルスを使用して超高速磁化逆転の実現可能性を調査する.
  • 最小のフィールド強度で磁化逆転を誘発するための最適な条件を決定する.

主な方法:

  • 薄いコバルトフィルムに2ピコ秒の短い磁場パルスを適用する.
  • 磁場パルスの方向を磁化に比べて変化させる.

主要な成果:

  • 磁気化の逆転は,2ピコ秒の磁場パルスを使用して達成されました.
  • プレセッショナル反転につながる最大トルクは,磁場が磁化に垂直であるときに発生しました.
  • 効率的な反転は,メートルあたり184キロアンペアという低いフィールドで実証されました.

結論:

  • ピコ秒磁場パルスは,コバルトフィルムにおける超高速磁化逆転を可能にします.
  • この研究は,先進的で高速な磁気記録技術の開発の可能性を強調しています.