Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics.

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I kinda knew that about aluminum...use it a lot in magnets..

Posted by jneutron (A) on January 8, 2007 at 13:10:40

In Reply to: Wrong, don't forget aluminum is a paramagnet, not non-magnetic. posted by cheap-Jack on January 8, 2007 at 12:57:31:

cj: ""
I said in my previous post the CD 'magnetizer' I tested gave out a loud vibration noise showing the very strong magnetic field was acting onto the CD under test.""
That is why I asked about the cd getting hotter. Eddy current dissipation possibility.

cj: ""
I can only suggest the temporary horrible sound generated immediately after the treatment is that aluminum, being a paramagnetic material, not non-magnetic like wood or plastic, is still affected MOMENTARILY by the very strong magnetic field.""
By definition, paramagnetic states no residual after the field is gone, not a time dependent decay. So it should be affected only when the field is on, not after. This is exactly what you say in the next sentences:
cj: ""
In other words, the dipoles of their atoms or modules do not interact with each other until a strong external magnetic field applied to them. But once the magnetic field is removed, the atom dipoles are back to their random orientations. ""

cj: ""
My question is: how such strong magnetic field would improve the music - as the CD magnetizer vendors so claimed? Neither my test showed it, nor the paramagnetic science can explain it.

If any claim cannot be explained by theroy & any rationals, or proven in practice, I would dismiss it as snake oil."
Concur on both points. However, what is still in question is, why there was a lasting effect you heard. The only thing I can think of is thermal, that's the kind of time constant you're alluding to. So my question, did the thingy heat the cd up at all?

Cheers, John

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