Title :
Magnetic viscosity of uniform γ-Fe2O3 particles with different degrees of cationic ordering
Author :
Morales, M.P. ; de Julian, C. ; Serna, C.J. ; Gonzalez, J.M.
Author_Institution :
Inst. de Ciencia de Mater., CSIC, Madrid, Spain
fDate :
3/1/1994 12:00:00 AM
Abstract :
Results are presented about the time dependence of the magnetization in γ-Fe2O3 particles obtained from α-Fe2O3 through a reduction-oxidation process. The precursor particles were prepared by homogeneous hydrolysis in solution. This preparation method led to a narrow distribution of particle dimensions which allowed us to consider the particles as being monodisperse. The viscosity study included the evaluation of the activation volume of pressed powder samples formed by spindle-like γ-Fe2O3 particles (aspect ratio 6) with different degree of order in their cationic distribution, at temperatures from 100 to 480 K
Keywords :
iron compounds; magnetic properties of fine particles; magnetisation; 100 to 400 K; Fe2O3; activation volume; cationic ordering; homogeneous hydrolysis; magnetic viscosity; magnetization; time dependence; uniform γ-Fe2O3 particles; Coercive force; Iron; Magnetic anisotropy; Magnetic field measurement; Magnetic properties; Perpendicular magnetic anisotropy; Saturation magnetization; Temperature dependence; Viscosity; X-ray scattering;
Journal_Title :
Magnetics, IEEE Transactions on
