BIFURCATION SOLUTIONS OF BROWN'S EQUATIONS AND PROBLEMS OF NUCLEATION IN MAGNETIZATION REVERSAL AND OF FORMATION OF INCIPIENT MAGNETIC DOMAIN

We assume that in general D is an ellipsoid （including sphere, infinite elliptic cylinder and infinite plane sheet as particular cases）, H is homogeneous and [（?）g/（?）a]γ=1—hx[k]—Hx=[（?）g/（?）β]γ=1—hy[k]—Hy=0. Then, for any value of Hx and any size of D, the saturation state or signle-domain state, u=0 and γ=1,