Actually as far as I can tell from a quick search - I'm no expert so if you are one, I'll take your word for it - all metals are affected by magnetic fields, just not to the same degree.
To quote the relevant part of the link:
Numerous metals are not ferromagnetic. Common examples are copper, silver, aluminum, lead, magnesium, platinum and tungsten. All materials, however, react to magnetic fields in one of three ways:



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