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関連する概念動画

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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 Fields01:28

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 due to Moving Charges01:25

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

Magnetic Field Due to Two Straight Wires

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.

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関連する実験動画

Updated: Jul 12, 2026

Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

不規則な磁石における一貫したスピン振動.

S Ghosh1, R Parthasarathy, T F Rosenbaum

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

Science (New York, N.Y.)
|June 22, 2002
PubMed
まとめ

研究者らは,磁気材料で新しいスピン液体状態を発見した. この状態は,ユニークなスペクトル特性を示し,複数の周波数で同時に情報エンコーディングを可能にします.

科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • 量子磁気は,量子磁気という

背景:

  • 従来のガラスは冷却時にユニークなスペクトル特性を発揮します.
  • 固体マトリックス内の磁気二極体は,通常,低温で凍結する.

研究 の 目的:

  • 固体マトリックスにおけるランダムに分布した磁気二極の低温の振る舞いを調査する.
  • 凝縮状態のスペクトル特性とダイナミクスを特徴付ける.

主な方法:

  • ランダムに分布した磁気二極体で固体マトリックスを低温まで冷却する.
  • 非線形磁力ダイナミクスを測定する.
  • スペクトルの性質とスピンの振動を分析する.

主要な成果:

  • 磁気二極は,スピンの液体状態に凝縮され,従来のガラスとは正反対のスペクトル特性を示す.
  • 何百回ものスピンを伴う一貫したスピン振動が観察され,寿命は最大10秒であった.
  • これらのスピン刺激は周波数調節可能であり,磁場によって操作できます.

結論:

  • 発見されたスピン液体は,独特の磁気特性を持つ新しい物質状態を表しています.

さらに関連する動画

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

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

関連する実験動画

Last Updated: Jul 12, 2026

Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

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

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

  • 一貫したスピン振動は,高度な情報エンコーディングと量子技術の可能性を秘めています.