I am modeling a magnetic coil array in Opera v15. My current project uses a CosΘ Coil inside a Metglas cylinder (Ferromagnetic) inside a Pb cylinder (Superconducting) at 4ºK. The method used to specify the a material in Opera is to specify the Coercivity and Relative Permeability. If I had a hysteresis curve, then the coercivity would be the distance along the H axis from the origin to the leftmost intersection point of the curve. Correct? I need to define the coercivity of the Pb Shield for the program, which is superconducting. But the hysteresis plot for a superconductor doesn't really make sense to me. In my mind I see a very thin line and so I think the coercivity would be extremely small. Perhaps this question is silly (or I'm just a grad student) but I find that when I talk to Professors about it, they seem to want to avoid the topic. I've researched for many hours online and haven't found what I am looking for. Does this analysis seem correct? Are there any references online I could look at to help clarify this topic?