The BH nonlinear permanent magnet constitutive relation available in the Magnetic Fields and Magnetic Fields, No Currents interfaces is intended for easy modeling of self-demagnetization of soft permanent magnets (for example, AlNiCo). It uses a nonlinear BH-relation that is isotropic around a point in H space that is shifted by the coercive field Hc. The shifted B-H and H-B curves that are specified in the associated material node are thus supplied in the first quadrant; that is, they are shifted by Hc with respect to the uniaxial curve. The AC/DC material library in the Add Material window contains an example material, Nonlinear Permanent Magnet to be used with this constitutive relation. It is a generic and approximate representation of AlNiCo 5.