The permeability of iron varies with temperature.
Not only does it change with temperature but iron has a non-linear
permeability. It varies depending on magnetic field and previous
Which permeability are you interested in? Maximum permeability,
initial permeability, permeability at saturation, etc.?
_Ferromagnetism_ by Bozorth has a chart showing the maximum & initial
permeabilities vs. temperature.
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