Title :
Magnetization reversal mechanisms in colloidal dispersions of magnetite particles
Author :
Gonzalez, J.M. ; Montero, M.I. ; Perez, J. A Lopez ; Mira, J. ; Lopez-Quintela, M.A. ; Rivas, J. ; Batllé, X. ; Labarta, A.
Author_Institution :
Inst. de Ciencia de Mater., CSIC, Madrid, Spain
fDate :
7/1/1998 12:00:00 AM
Abstract :
We have studied the structural and magnetic properties of colloids consisting of different concentrations of magnetite particles dispersed in kerosene. Our data for the temperature dependence of the low field magnetization and the saturation coercive force of the samples evidenced the occurrence, in different temperature ranges, of Neel- and Brown-type relaxation processes whose characteristics were largely influenced by strong dipolar interparticle interactions
Keywords :
coercive force; iron compounds; magnetic fluids; magnetic particles; magnetic relaxation; magnetisation reversal; Brown-type relaxation; Fe3O4; Neel-type relaxation; colloidal dispersion; dipolar interaction; kerosene; magnetic properties; magnetite particles; magnetization reversal; saturation coercive force; structural properties; temperature dependence; Coercive force; Magnetic devices; Magnetic field measurement; Magnetic materials; Magnetic properties; Magnetization reversal; Nanoparticles; Saturation magnetization; Temperature dependence; Temperature distribution;
Journal_Title :
Magnetics, IEEE Transactions on
