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# Re: [FEMM] complex permeability

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- Subject: Re: [FEMM] complex permeability
- From: David Meeker <dmeeker@ieee.org>
- Date: Wed, 07 Apr 2004 11:08:29 -0400
- In-reply-to: <407425C5.1080103@if.ufrgs.br>
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`Gilberto Fraga wrote:`

>     Dear Dr. David Meeker,
>     Dear all,

> `I need help in the folowing problem.
> I measure de complex impedance of diferents magnetic materials.
> The porpouse of these measurements is to determine the complex magnetic permeability as a function of temperature, frequence and external
> magnetic field (magnetoimpedance).
> I would like to know if the FEMM works with complex permeability ( using LUA perhaps?).`
> `Best regards,`
> `Gilberto Fraga`

`
Yes, FEMM supports complex permeability. The phi_hx and phi_hy parameters are angles that define the argument of the complex permeability. It is possible to define different angles in different directions to account for anisotropic materials. Anyhow, the permeability used in solving problems is mu_x * exp(-j*phi_hx) for the x-direction and mu_y * exp(-j*phi_hy) in the y-direction, where j=sqrt(-1).`
`Dave.`

- References:
  - [FEMM] complex permeability
    - From: Gilberto Fraga <fraga@if.ufrgs.br>

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