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