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Originally Posted by eugenebrooks
High permeability material, sold under the trade name "mu metal"
is used to shield magnetic fields.
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Gene,
Do you have a source for mumetal, we are almost out of the sheet stock and I need to replenish but have only been half hearted about looking.
Ferro fluid is not a magnet it is ferrous metal particles suspended in a viscous liquid. It is most commonly used for speaker voice coil cooling. A few drops squirted into the gap between the voice coil and the magnet structure will do a great job of transferring heat to the magnet body and basket assy without changing the damping of the speaker.