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Related Concept Videos

Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
Potential Due to a Magnetized Object01:24

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...
Magnetic Vector Potential01:15

Magnetic Vector Potential

In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
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Magnetism01:30

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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
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Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
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Updated: Jun 22, 2026

Measuring the Influence of Magnetic Vestibular Stimulation on Nystagmus, Self-Motion Perception, and Cognitive Performance in a 7T MRT
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Vibro-magnetometry: theoretical aspects and simulations.

Adilton O Carneiro1, Oswaldo Baffa, Glauber T Silva

  • 1Departamento de Física e Matemática, Universidade de São Paulo, Brazil. adilton@usp.br

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|May 29, 2009
PubMed
Summary
This summary is machine-generated.

Vibro-magnetometry uses ultrasound to vibrate magnetic targets, measuring the resulting magnetic field to understand material properties. This method effectively evaluates acoustic radiation force and soft material mechanics.

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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
09:43

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

Published on: November 7, 2017

Area of Science:

  • Physics
  • Materials Science
  • Biophysics

Background:

  • Mechanical vibrations of targets in fluids are challenging to measure.
  • Acoustic radiation force is a known phenomenon but its application in material characterization is limited.

Purpose of the Study:

  • To introduce the theory and computational simulations for vibro-magnetometry (VM).
  • To propose a novel method for interrogating mechanical vibrations using acoustic radiation force and magnetic measurements.
  • To establish the relationship between magnetic field signals and ultrasonic pressure fields for material characterization.

Main Methods:

  • Utilizing amplitude-modulated ultrasound to generate a dynamic acoustic radiation force on a magnetic target immersed in a viscoelastic medium.
  • Measuring the magnetic field generated by the target's vibration.
  • Simulating the process to estimate radiation-force-induced displacement over time.

Main Results:

  • The magnetic field signal is directly related to the ultrasonic pressure field and the medium's mechanical properties.
  • The dynamic component of the magnetic field is detectable by conventional magnetic sensors.
  • The method successfully quantifies acoustic radiation force and mechanical properties of soft materials.

Conclusions:

  • Vibro-magnetometry offers a powerful, non-invasive tool for evaluating acoustic radiation force.
  • The proposed methodology enables precise characterization of the mechanical properties of soft materials.
  • This technique has potential applications in various fields requiring sensitive mechanical analysis.