The magnetic saturation induction values in SQUID VSM and B-H tracer are too much different. For example, The magnetic saturation induction value for Fe78Si9B13 is 0.8T in B-H tracer, but in SQUID VSM is 1.4T. What is the reason for different values?
My gut feeling is that it has something to do with the geometry dependent correction for demagnetization. The SQUID measures the moment, m. If you want the moment from B you employ B=mu_0(H+M) with M=m/volume. The B-field outside the sample is simply given by B=mu_0 H_applied. The B-field inside the sample is given by B=mu_0(H_i+M). H_i and H_applied are not identical. H_i=H_a+H_demag. The demagnetizing field, H_demag, depends in a complicated way on M. The relation is only simple if the sample is uniformly magnetized and ellipsoidal in shape. Then you can employ the concept of demagnetizing factors if H is applied along a principle axis, otherwise you need the full tensor.