I What makes cobalt oxide (co3o4) a magnetic material?

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Which compunds of cobalts are magnetic?
We know cobalt is a magnetic material, it can attracted by magnet. Now if we want to know for example cobalt oxide (co3o4) has magnetic property or not what we should do? I mean is there a role to know bonding of cobalt with which elements results in magnetic property? or is there any online website that list all kind of magnetic materials with details?
 
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