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In Reply to: RE: So what's the deal with CD demagnetizers? posted by geoffkait on November 08, 2015 at 14:55:08
I did not know that aluminum was magnetic?
Follow Ups:
"I did not know that aluminum was magnetic?"It's not. Nobody said it was. Didn't you read my post? What I suggest is that there could be traces of ferrous elements in the aluminum or in the ink on the label. I'm giving the proponents of demagnetizing the benefit of the doubt. In other words, I'm questioning the CD demagnetizing, not supporting it. Hel-loo! What I'm saying is, even if there are trace elements the magnetic field thus produced would be too weak to explain the results obtained by demagnetization and therefore the whole demagnetizing of CDs thing is a mystery. Follow?
Edits: 01/30/16
The most common impurity in an aluminum sputtering target would be silicon, and than only to the tune of maybe 1% to 1 1/2%. That is the Maximum Uptake of Si in Al at temperatur of maximum solubility.
The reason is that in semiconductor processing, which shares some equipment with the manufacture of CDs, when the Silicon Devices are 'annealed' (heat treated) the silicon in the electrical contacts will 'spike' up into the aluminum conductor. But NOT if the Aluminum already contains silicon.
Too much is never enough
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