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# Re: [FEMM] BH curves, intrinsic?

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- Subject: Re: [FEMM] BH curves, intrinsic?
- From: David Meeker <dmeeker@ieee.org>
- Date: Wed, 17 Mar 2004 00:01:58 -0500
- In-reply-to: <HMEDIFOAJEANOMJAIFDGOEAFCIAA.jean-michel.le_cleach@ensmp.fr>
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`Jean-Michel Le Cléac'h wrote:`

> `Hello,`
> `I want to enter a new ferromagnetic metal in my "material library".`
> `I have the intrinsic BH curve of the metal.`

>     After editing all the BH curves for ferromagnetic metals in the actual FEMM
>     library, I can see that the BH curves are not the "intrinsic curves" but
>     that a term in ( 10^6 . H ) is added (probably to enter the "total" B at a
>     given H).

`The curve that you should enter into femm is the "total" b that results from a given applied h. That is, if you have an "intrinsic" curve where you have an intrinsic induction bi(h), you can create the "total b" by:
b(h)=bi(h) +muo*h
where muo=4*PI*10^(-7) H/m =1.2566370614359173e-6 H/m is the permeability of free space in MKS units. You then enter a series of (b(h),h) points as your curve.`
`Dave.`

- References:
  - [FEMM] BH curves, intrinsic?
    - From: "Jean-Michel Le Cléac'h" <jean-michel.le_cleach@ensmp.fr>

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