LAW OF APPROACH TO SATURATION FOR POLYCRYSTALLINE FERROMAGNETS - REMANENT INITIAL-STATE

We consider the approach to saturation for cubic and uniaxial polycrys talline, single-domain ferromagnets from the remanent state. For both cubic {111}- and {100}-easy systems we find that the coefficient beta in the law M(H) approximate to M(1-beta K-2/(MH2)-H-2), where M is the saturation magnetization and K is the principal anisotropy [GRAPHICS] constant, departs from the well-known result beta = 8/105 obtained fo r an initially isotropic moment distribution. The coefficients for the two easy-axis systems become distinct, and we calculate the dependenc e of beta on the angle between the primary magnetic field which establ ished the remanent state and the second saturating field H. For uniaxi al systems we show that beta=4/15 for the remanent state, identical to its standard value for the isotropic initial state. [S0163-1829(98)08 217-4].