Re: [FEMM] complex permeability

[David Meeker <dmeeker@xxxxxxxx>]

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.