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# Re: BH data

- To: femm@yahoogroups.com
- Subject: Re: BH data
- From: "mikejhutch" <mhutchings@solartronmetrology.com>
- Date: Wed, 23 Oct 2002 08:21:40 -0000
- In-reply-to: <5.1.0.14.0.20021023080512.00abc6a0@staff-mailin.lboro.ac.uk>
- User-agent: eGroups-EW/0.82

    Hi Keith

    The d.c. hysteresis loops cited are from manufacturers data (Telcon
    Metals, Crawley, long since defunct). Presumably these would be
    compiled from slow changes at a few Hz max; if not then a.c. effects
    may come into play.

    I am currently interested in trying to observe Barkhausen noise for
    NiFe materials. I expect to use up to about 100 Hz field for this, and
    believe that the spectrum of the noise will contain much information,
    if it can be unravelled; early days yet. Comments are very welcome

    Mike

    --- In femm@y..., Keith Gregory <k.gregory@l...> wrote:
    > Michael,
    >
    > Could I ask what you mean by low frequency?
    >
    > Keith.
    >
    > At 15:30 21/10/2002 +0100, you wrote:
    >
    > >Hi David (Meeker) and others,
    > >
    > >I am trying to include Radiometal in the materials library. I have
    the
    > >manufacturers data for d.c. induction but it is in the form of an
    initial
    > >magnetisation curve. This is unlike the mumetal and supermalloy
    materials
    > >in the femm library, which show a high initial slope /
    permeability,
    > >declining steadily as saturation is approached. These plots ignore
    hysteresis.
    > >
    > >I am tempted to input data from the radiometal d.c. hysteresis
    loops which
    > >I also have, shifted to pass through the origin. At least then the
    plot
    > >shape is correct. Is this likely to give acceptable results for
    modelling
    > >of low frequency fields and inductances?
    > >
    > >Perhaps the included BH curves are similarly derived. I feel it
    will be
    > >better to do this than use a description with an initially
    increasing
    > >permeability with H.
    > >
    > >BTW thank you for an excellent free tool, and all the inputs to an
    > >interesting discussion group.
    > >
    > >Michael J Hutchings

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