DocumentCode :
974178
Title :
On the microstructure and magnetization process of γ-Fe2O3
Author :
Cecchetti, A. ; Corradi, A.R. ; Fagherazzi, G.
Author_Institution :
Gruppo Nazionale di Struttura della Materia, Istituto di Fisica, Universita di Ferrara, Italy.
Volume :
16
Issue :
1
fYear :
1980
fDate :
1/1/1980 12:00:00 AM
Firstpage :
86
Lastpage :
88
Abstract :
Experimental evidence is reported for γ-Fe2O3single particles being made up of several microcrystals chained together and their boundaries being sources of demagnetizing fields. This leads to a very defined picture of the magnetization reversal in partially alligned γ-Fe2O3particles: rotation is incoherent but the magnetization vectors are scattered in such a way that Hcivs. angle Ψ (between the orientation direction and the applied field) does not follow the known magnetization reversal modes. The importance of the reduction temperature in the process: α-FeOOH under\\rightarrow{red.} Fe3O4 under\\rightarrow{ox.} γ-Fe2O3becomes extremely important if considered as the parameter which rules the pore closure within the particles, i.e. the size and number of microcrystals chained in a single particle.
Keywords :
Magnetic tape recording materials; Magnetization reversal; Assembly; Coercive force; Human computer interaction; Magnetization processes; Magnetization reversal; Microstructure; Particle measurements; Powders; Rotation measurement; Temperature;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1980.1060541
Filename :
1060541
Link To Document :
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