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# Re: [femm] Diamagnetism

- To: femm@yahoogroups.com
- Subject: Re: [femm] Diamagnetism
- From: David Meeker <dmeeker@foster-miller.com>
- Date: Mon, 04 Mar 2002 12:55:23 -0500
- References: <a5rh0e+fnou@eGroups.com>

    roberthillier wrote:

    > Hi All!
    > As a newby , will I be wasting my time getting to grips with FEMM if
    > I want to model diamagnetic stabilisation of permanent magnet
    > levitation? (I can't find "diamagnetic" or "susceptibility" in the
    > messages index for this group, so I guess that FEMM might not be my
    > best bet for this problem.)
    > If so, can anyone please recommend an alternative ( free ) software
    > package? I'm particularly interested in modelling the effects of
    > diamagnetics with holes in them in this problem.
    > Thanks
    > Robert Hillier

    You ought to be able to model paramagnetic materials with femm. These are
    just materials in which the relative permeability is (slightly) less than 1.
    For example, you'd model bismuth as a material with a relative permeability
    of like 0.999834. I haven't really mucked around much with diamagnetic
    materials, but since the effect is a subtle one, you may need to make models
    with rather fine meshing to resolve it accurately (so that discretization
    error isn't larger than the effect that you are trying to observe).

    Da

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- References:
  - Diamagnetism
    - From: "roberthillier" <roberthillier@yahoo.co.uk>

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