# consideration of the demagnetization field in magnetized materials?

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Hello all,

i've got a question concerning the deposited material principles.

How does flux calculate the magnetic field strength H respectively the magnetic flux density B of a magnetized material?

Is it done in consideration of the demagnetization field H_dem = -N_dem*M and the differentation between external and internal magnetic field (H_int = H_appl + H_dem)?

Because at this moment i don't know which magnitudes are shown in the post-processing view.

Thanks for your help!

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Hello,

The demagnetizing field is taken into account through the geometry. In Flux 2D, we compute the flux density B through the formula

B = Curl (A) where A is the vector potential , having only a Z component in 2D).

Then the magnetic field H is computed with the next formula:

B = Mu0 * MuR * H (where Mu0 is the relative permeability of vacuum, 4*pi*1E-7, and MuR is the relative permeability of magnetic material)

When you have a magnet, then the formula is the following:

B= Mu0 * MuR * H + Br (where Br is the remanent flux density)

In the Flux formula editor you can directly compute B, H, MuR, and even Br with these names.

I hope it will help.

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