Good point, Desmostylus, but for a pulse it might be more suitable to substitute omega(w) for (pi . f).
Also, shouldn’t it be 2pi x f?
You could write it as sqrt( 2 / (w . mu . sigma)).
It’s exactly the same, but your way looks messier.
I was thinking of the convenience of plugging the rate of change directly into the equation rather than having to calculate a frequency. Plus, I’m pretty sure the formula would be different for an EMP, which would be roughly a square wave.
I think the term you are looking for is “step function” rather than “square wave”.
But the model of the incident pulse doesn’t alter the properties of the shielding material.
Anyway, to compare some different materials, here’s a few skin depth examples at f = 1 MHz, with skin depths given in microns.
Silver 63
Copper 65
Gold 78
Chromium 81
Aluminum 84
Brass 95
Magnesium 108
Tungsten 118
Zinc 119
Cadmium 136
Nickel 140
Phosphor-Bronze 140
Tin 169
Beryllium 207
Lead 231
Monel 323
Manganese 327
Titanium 331
Silicon Iron 43
Permalloy 20
Hypernik 15
Mu-Metal 7
Supermalloy 3
Iron (purified) 16
Iron 50
Steel 93