How Do You Classify Materials Based on Magnetic Susceptibility?

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Max Eilerson
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Hi,

I'm just given the magnetic susceptibiliy of materails [tex]\chi[/tex], for which I'm supposed to identify what class of magnetic materail they belong too. Some basic rules are listed in the notes.

Ferromagnets [tex]\chi > 0, u >> 1[/tex]

cold rolled steel 2250
Monimax 669


Paramagnets [tex]\chi > 0, u > 1[/tex]

Oxygen (liquid at -219 C) 3.9E-4
Manganese 1.0E-6
Chorium 4.5E-6

Diamagnet ([tex]\chi < 0, u < 1[/tex]

Ice - 8.1E-6 (I know ice XI is ferrielectric)
Helium - 0.58E-6

However I looked on wiki and it appears Chormium is antiferromagnetic and manganese is non-magnetic. I'm fairly sure sure helium is a superconductor. This is question 1, on an easy work sheet so I'm not sure what to answer.
 
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From the values you have provided, it looks like cold rolled steel and Monimax are ferromagnets, Oxygen is a paramagnet, Ice is a diamagnet, and Helium is a superconductor. However, since you have noted that Chrome is antiferromagnetic and Manganese is non-magnetic, it would be best to double check with other sources before making your final decision.