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# [femm] Materials....

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- Subject: [femm] Materials....
- From: "Scott Norton" <scott_norton@surromed.com>
- Date: Tue, 14 Mar 2000 15:08:58 -0800
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    Like others, let me first claim my ignorance about magnetics...
    (Why do the equations have to seem so much more complicated than
    electrostatics!?!?)

    My mission: To increase the B field gradient in a very small
    localized volume. I have a couple nice fairly large magnets and I
    want to introduce some strips of metal material around my small volume
    to
    cause large field gradients. I'd like to explore my options
    using FEMM.

    First of all, what type of material am I looking for that enhances
    magnetic field gradients? What's the material specification that tells
    one
    this? For instance, I've seen nickel strips introduced into a uniform
    magnetic field that was used to create gradients. Why was
    it chosen? What's better? If I was to model nickel in FEMM, do I need
    the BH curves or is magnetic permeability enough?

    Any information would be really helpful! Thanks!
    -Scott

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