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関連する概念動画

Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

11.3K
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...
11.3K
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

5.2K
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.
5.2K
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

1.9K
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...
1.9K
Magnetic Damping01:17

Magnetic Damping

1.3K
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
1.3K
Mass Analyzers: Overview01:13

Mass Analyzers: Overview

2.0K
The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
2.0K
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

870
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
870

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関連する実験動画

Updated: May 4, 2026

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

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交換バイアスによる超パラマグネティック限界の打ち破り

Vassil Skumryev1, Stoyan Stoyanov, Yong Zhang

  • 1Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA. vassil@udel.edu

Nature
|June 20, 2003
PubMed
まとめ

研究者は,磁性ナノ粒子における超パラマグネティック限界を克服する方法を開発した. 鉄磁性コバルトナノ粒子を反鉄磁性マトリックスと結合することにより,より高い温度で安定した磁気秩序が達成され,データ保存と医学における潜在的な応用が可能になりました.

科学分野:

  • 材料科学 材料科学とは
  • ナノテクノロジー ナノテクノロジー
  • 凝縮物質物理学 凝縮物質物理学

背景:

  • 磁性ナノ粒子は,データ保存と医療の可能性を秘めています.
  • 磁性ナノ粒子の小型化は,熱エネルギーが磁気モメントの不安定性を引き起こす超パラマグネット効果によって制限されます.
  • この不安定性は,超パラマグネティック限界として知られており,安定した磁気秩序を必要とするアプリケーションを妨げています.

研究 の 目的:

  • 磁性アニソトロピーを強化し,磁性ナノ粒子の磁化安定性を達成するための方法を調査する.
  • 界面磁気交換カップリングを利用して超パラマグネティック限界を克服する.
  • コバルトナノ粒子を異なるマトリックスで使って原理を実証する.

主な方法:

  • 鉄磁性コバルトナノ粒子の製造 (約. 4nm) がパラ磁性または反鉄磁性マトリックスに埋め込まれています.
  • 磁気特性の特徴と温度に依存する磁気化の安定性.
  • 磁気交換カップリングの分析 磁気交換カップリングの分析 磁気交換カップリング

主要な成果:

  • パラ磁性マトリックス内のコバルトナノ粒子は,10Kで磁気モメントを失いました.
  • コバルトナノ粒子は,反鉄磁性マトリックスで,約290Kまで鉄磁性を保ちました.

さらに関連する動画

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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関連する実験動画

Last Updated: May 4, 2026

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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  • 強化された磁気安定性は,インターフェイス磁気交換カップリングに起因しました.

    • 結論:

    • 鉄磁性物質と反鉄磁性物質の間のインターフェイス磁気交換コップリングは,磁気アニソトロピーを大幅に高めることができます.
    • このアプローチは,超パラマグネティック限界を効果的に克服し,より高い温度でナノ粒子の安定した磁気秩序を可能にします.
    • この発見は,超高密度記録や生物医学などの分野における磁性ナノ粒子の高度な応用への道を開く.