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Ferromagnetism01:31

Ferromagnetism

2.5K
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...
2.5K
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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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.
5.2K
Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

4.4K
A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
Consider a solenoid with 100 turns wrapped around a cylinder of...
4.4K
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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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...
9.5K
Divergence and Curl of Magnetic Field01:26

Divergence and Curl of Magnetic Field

3.3K
The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
3.3K
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

4.9K
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
4.9K

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Related Experiment Video

Updated: Oct 15, 2025

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

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Reversible magnetic spiral domain.

Kyoung-Woong Moon1, Seungmo Yang1, Chanyong Hwang2

  • 1Quantum Spin Team, Korea Research Institute of Standards and Science, Daejeon, 34113, Republic of Korea.

Scientific Reports
|October 26, 2021
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate a novel rotating magnetic spiral with easily reversible winding direction. This discovery in magnetic systems could lead to new applications and the creation of magnetic skyrmions.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Magnetism

Background:

  • Spiral structures are prevalent in nature and utilized across various disciplines.
  • Reversing the winding direction of natural spirals is typically challenging.
  • Magnetic systems offer potential for novel spiral dynamics.

Purpose of the Study:

  • To investigate the existence and properties of a controllable rotating magnetic spiral.
  • To explore the mechanism for reversing the winding direction of magnetic spirals.
  • To understand the relationship between magnetic spirals and magnetic skyrmions.

Main Methods:

  • Modeling magnetization vector dynamics under radial current and Dzyaloshinskii-Moriya interaction.
  • Analyzing the stability and control of the magnetic spiral's winding direction.
  • Investigating the behavior of magnetic domains at the spiral's edge.

Main Results:

  • A rotating magnetic spiral with controllable winding direction was successfully demonstrated.
  • The winding direction can be reversed using an external magnetic field.
  • The finite size of the magnetic spiral leads to domain destruction at its edge, forming magnetic skyrmions.

Conclusions:

  • The study presents a novel magnetic system exhibiting a controllable rotating spiral.
  • This controllable magnetic spiral offers a pathway for generating magnetic skyrmions.
  • The findings have potential implications for spintronics and magnetic data storage.