Fig. 4From: The Magnetic Susceptibility Bifurcation in the Ni-Doped Sb2Te3 Topological Insulator with Antiferromagnetic Order Accompanied by Weak Ferromagnetic AlignmentTop-left inset: The magnetic susceptibility difference of field cooled and zero-field cooled follows the mean field theory. The extracted saturated susceptibility goes well with the tendency of the measured magnetic susceptibility cuspBack to article page