Calculating Demagnetization Factor: N for Simple Geometries

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SUMMARY

This discussion focuses on calculating the demagnetization factor N for simple geometries, specifically long cylinders and thin films. The user seeks straightforward references and clarification on how demagnetization arises due to boundary effects, particularly in cylindrical magnets with axial magnetization. Additionally, the user questions the principle that the sum of demagnetization factors across all three axes equals unity. Key references include the publication by Compter and van der Veen on magnet analysis using a Helmholtz coil set.

PREREQUISITES
  • Understanding of demagnetization factors in magnetic materials
  • Familiarity with simple geometries such as long cylinders and thin films
  • Knowledge of magnetic dipole moments and their behavior at boundaries
  • Basic principles of magnetostatics
NEXT STEPS
  • Research methods for calculating demagnetization factors for long cylinders and thin films
  • Study the boundary effects on magnetization in cylindrical magnets
  • Explore the mathematical proof that the sum of demagnetization factors equals unity
  • Review the publication by Compter and van der Veen for practical applications of demagnetization factors
USEFUL FOR

Students and researchers in physics and materials science, particularly those focusing on magnetism and magnetic material analysis.

sniffer
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i have little questions which make me banging my head against the wall over the last few days.

now, before too many walls collapsed :

1. can anyone direct me to an easy reference which explain how to calculate demagnetization factor N for simple geometries (such as long cylinder, thin films, etc). remember, a simple one! not ellipsoids!

2. i believe demagnetization arises because of the boundary effect. is this correct? to be exact, how? i thought this is because at the boundary (if we talk about a cylindrical magnet with magnetization along its axis) the dipole moment there does not have a pair. is this correct? can anyone explain in cleaner way?

3. and why the sum of demagnetization factor in all 3 axes is always unity? or is it?

for those who attempt good response, i would thank very much.
especially gokul43201 who responded my few questions in the past. thanks for the help.
 
Physics news on Phys.org
Look in my publication in Magnet analysis with a Helmholz coil set
Compter, J.C. van der Veen, J.L.F.
Page(s): 177 - 182
Digital Object Identifier : 10.1049/ip-smt:20030495

Abstract | Full Text: PDF (400KB)
 

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