DETERMINATION OF SPIN REORIENTATION ANGLE OF CONE ANISOTROPIC MATERIAL FROM MAGNETIZATION CURVES OF MAGNETICALLY ALIGNED POWDERS

A method to calculate the spin reorientation angle of cone anisotropic material from parallel and perpendicular magnetization curves of an a ligned particle system is suggested. In this method, the spin reorient ation angle is expressed as a function of remanent magnetizations para llel and perpendicular to alignment direction and particle alignment f actor. The effect of basal plane anisotropy is included in the calcula tion, and a slight underestimation results if it is neglected. Experim ents on Nd-2(Fe0.9Co0.1)(14)B particles showed a spin reorientation an gle of 29.2 degrees at 4.2 K. The underestimation in spin reorientatio n angle due to the neglect of basal plane anisotropy was about 9% for Nd-2(Fe0.9Co0.1)(14)B at 4.2 K.