Title :
Influence of porosity and preparation conditions on the properties of γ-Fe2O3
Author :
Corradi, A.R. ; Green, W.B. ; Price, T.G. ; Bottoni, G. ; Candolfo, D. ; Cecchetti, A. ; Masoli, F. ; Molesini, L.
Author_Institution :
Magnox Inc., Pulaski, VA, USA
fDate :
1/1/1990 12:00:00 AM
Abstract :
A summary is presented of the results of a development program for γ-Fe2O3 particle synthesis which lasted two years and whose aim was the preparation of improved products for magnetic recording. The focus of the exercise was the achievement of improved high-frequency recording characteristics. The goal has been achieved in two steps: the first was the realization of the limits of coercivity attainable by decreasing the particles size, while the second was entirely related to the optimization of the total amount and of the type of porosity and porosity distributions. Important conclusions on the correlation between the size of the switching unit (dependent, among other things, on porosity) and the applicative properties can be drawn from the results
Keywords :
coercive force; ferrites; iron compounds; magnetic properties of fine particles; magnetic recording; magnetic switching; particle size; porosity; powder technology; γ-Fe2O3; Fe2O3; coercivity; high-frequency recording characteristics; magnetic recording; particle synthesis; particles size; porosity; porosity distributions; preparation conditions; switching unit; Assembly; Coercive force; Disk recording; Frequency; Magnetic materials; Magnetic properties; Magnetic recording; Magnetization; Microstructure; Stability;
Journal_Title :
Magnetics, IEEE Transactions on
