How do you calculate the Magnetic Moment of a Permanent Magnet?

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SUMMARY

The discussion focuses on calculating the magnetic moment of a permanent AlNiCo magnet, specifically targeting a value of 0.06 Am². Participants highlight that magnet data sheets typically provide magnetic field strength in Tesla or moment in Vs·cm, rather than directly in Am². To convert these values, it is essential to understand the relationship between magnetic permeability and the units involved, specifically using the permeability of free space (μ₀) and considering the volume of the magnet for accurate approximation.

PREREQUISITES
  • Understanding of magnetic moment and its significance in magnetism.
  • Familiarity with units of measurement in electromagnetism, specifically Tesla and Vs·cm.
  • Knowledge of magnetic permeability, including μ₀ and μᵣ.
  • Basic concepts of volume calculations related to physical objects, particularly magnets.
NEXT STEPS
  • Research the conversion formulas between Tesla and magnetic moment in Am².
  • Learn about the properties of AlNiCo magnets and their applications.
  • Explore the concept of magnetic permeability and its role in magnet calculations.
  • Investigate methods for measuring the volume of permanent magnets accurately.
USEFUL FOR

Engineers, physicists, and students involved in magnetism studies, as well as anyone working with permanent magnets in practical applications.

drinksta
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Hey!

I am trying to find a permanent AlNiCo magnet with a magnetic moment of 0.06Am^2.

However, most magnet data sheets do not list the magnetic moment of their magnet. Often they list the Magnetic field in Tesla or the moment in Vs*cm. How can I convert this data into the magnetic moment in Am^2.

Thanks!
 
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V*s*m/(A*m^2) has the unit of magnetic permeability, so I think that you have to divide by this value (\mu_0 or \mu_0\mu_r, I would expect the former). cm<->m is just a factor of 100.

T/(V*s*m) is an inverse volume - maybe you can get some approximation of you multiply the value with the volume of the magnet (up to constant factors?)
 

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