Talk:Alnico

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[edit] Shielding

I remember hearing somewhere that nice watches sometimes have AlNiCo shield plates to keep them from being magnetized. However, mu metal claims that hard magnetic materials don't work as shield materials. I imagine that an "unmagnetized" block of material would keep its random local fields in the face of fields lower than its coercivity, and would work as a shield, but perhaps I'm wrong.

Any thoughts?--Joel 21:29, 8 May 2007 (UTC)