You have to be careful with random junkyard steel, not all of it is
necessarily that magnetic as I once found when testing steel tube in a
workshop.
One can test this with a magnet.
Mu metal saturates very easily and sometimes its necessary to reduce the
magnetic field using a higher saturation lower permeability material
first before using mu metal inside the outer shield.
Mu metal readily loses its shielding ability if bent or worked in any way.
Post fabrication annealing is usually required.
Dropping it, bending it or hitting it with a hammer can be sufficient to
negate its shielding effectiveness.
Adhesive backed thin foils can be easier to use:
http://www.advancemag.com
Hal Murray wrote:
If I had a bunch of mu metal sitting in the basement I'd certainly use
it in the setup. Last time I checked the stuff was not cheap ....
How good is mu metal relative to typical steel?
I'm interested in shielding/$. If I have $X to spend on shielding (for a
hobby project), am I better off spending it on mu metal or junk yard steel?
In this case, space or weight is not a significant disadvantage. (If I can
also use it as a thermal layer, it might even be an advantage.)
------------
Years ago, I was helping somebody with two displays. They were
interacting with each other in unpleasant ways. We tried some thin mu metal.
It didn't help much. A big chunk of 1/8 or 1/4 steel worked much better.
htt
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