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Magnetic Fields

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...

Potential Due to a Magnetized Object

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...

Atomic Nuclei: Nuclear Relaxation Processes

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.

Magnetic Field Due to Two Straight Wires

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.

Magnetic Field due to Moving Charges

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 Lines

Magnetic Field Lines

The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:

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Related Experiment Video

Updated: Nov 28, 2025

Scanning SQUID Study of Vortex Manipulation by Local Contact

Scanning SQUID Study of Vortex Manipulation by Local Contact

Published on: February 1, 2017

Nonlocal Stimulation of Three-Magnon Splitting in a Magnetic Vortex.

L Körber^1,2, K Schultheiss¹, T Hula^1,3

¹Helmholtz-Zentrum Dresden - Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, D-01328 Dresden, Germany.

Physical Review Letters

|December 1, 2020

Summary

Stimulated three-magnon splitting in magnetic disks can be triggered below threshold using magnons from a waveguide. This controllable method shows potential for neuromorphic computing applications.

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Area of Science:

Condensed Matter Physics
Spintronics
Nonlinear Magnetics

Background:

Three-magnon splitting is a nonlinear magnetic phenomenon.
Controlling nonlinear magnonic processes is crucial for advanced applications.
Vortex state magnetic disks offer unique magnonic properties.

Purpose of the Study:

To investigate stimulated three-magnon splitting in magnetic disks.
To explore triggering mechanisms below and above threshold.
To assess the potential for neuromorphic computing.

Main Methods:

Combined numerical simulations (micromagnetic modeling).
Theoretical analysis (rate-equation calculations).
Experimental validation using Brillouin light scattering (BLS) and time-resolved BLS.

Main Results:

Three-magnon splitting can be triggered below threshold by external magnon excitation.
Stimulation is effective over a broad range of powers and frequencies.
Experiments confirm instantaneous response and premature triggering above threshold.

Conclusions:

A controllable mechanism for stimulated three-magnon splitting is demonstrated.
This phenomenon can be precisely controlled using external magnonic signals.
Potential application in developing magnon-based nonlinear networks for neuromorphic computing.