magnetic shielding with mumetal(nonlinear - saturation)

Hi
I need some help with my model....
I have a 3D sim, A current line that generates my field and a mumetal infinite plane(1m*1m*0.5mm)
The 0.5mm is the thickness of my mumetal. I have 0.5T on the surface of the shield and i want to see the B behind the shield.
a.I use relative permeability constant at 7000.
b. I use a non-linear equation with saturation for relative permeability
μr= 1+[(μrmax-1)^(-1) + (μ0*/Η/ / B_sat)^(1/n)] ^(-1)
where mu_rmax=7000, B_sat=0.7T and n=1
c. I use the B-H and H-B curves filling them with my data curves.
Am I correct in any way of these models or I need some refinements to be more precise;
I can see the saturation and the B-H curve; How we can change the scales from a plot in comsol;
Also I attach some photos of my model.
Thanks in advance.