Abstract：The anisotropy constants K of γ-Fe2O3, Co-γ-Fe2O3 and Co ultrafine particles precipitated in Cu-Co alloy have been measured by wing the equations for describing the relaxation of superparamagnetic particles. It is found that the anisotropy constant K of Co-γ-Fe2O3 fine particles is greater than that of γ-Fe2O3 by about 50%; the K value of Co ultrafine particles of a radius equal to 36Å is greater than that of to 48Å by about 100%. This phenomenon has been interpreted as the existence of surface anisotropy of the Co ultrafine particles.
LUO Helie;SUN Ke;NIE xiangfu*. ON THE MAGNETIC ANISOTROPY OF THE Co AND γ-Fe2O3 ULTRAFINE PARTICLES
[J]. 中国物理快报, 1990, 7(8): 369-372.
LUO Helie, SUN Ke, NIE xiangfu*. ON THE MAGNETIC ANISOTROPY OF THE Co AND γ-Fe2O3 ULTRAFINE PARTICLES
. Chin. Phys. Lett., 1990, 7(8): 369-372.
1990, Vol. 7 
