# Identifying magnetic materails

1. Nov 12, 2006

### Max Eilerson

Hi,

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

Ferromagnets $$\chi > 0, u >> 1$$

cold rolled steel 2250
Monimax 669

Paramagnets $$\chi > 0, u > 1$$

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

Diamagnet ($$\chi < 0, u < 1$$

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.

Last edited: Nov 12, 2006