At low temperature, this quantity equals its value at absolute zero times the expression “1 minus temperature over critical temperature raised to the three-halves power.” Between Bloch domains, this vector rotates continuously about the normal of the Bloch wall plane. The volume bound current density equals (10[1])the curl of this quantity. (10[1])This quantity is the order parameter of the Ising model, in which it spontaneously (10[1])emerges as temperature is decreased in a phase transition. The H-field equals the B-field divided by the permeability of free space minus this quantity. When increasing the applied field no longer increases this quantity, a ferromagnet has become saturated. For 10 points, name this vector defined as the magnetic dipole moment per unit volume, (10[1])the magnetic analog of electric polarization. ■END■ (10[1]0[3])