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Composition dependence of discontinuous magnetization in CuxFe3-xO4+delta
Faculty
Science
Year:
1997
Type of Publication:
Article
Pages:
3749-3752
Authors:
WAFIK, AH, AbdElRahman, AM, Massoud, AM
DOI:
10.1023/A:1018663304461
Journal:
JOURNAL OF MATERIALS SCIENCE CHAPMAN HALL LTD
Volume:
32
Research Area:
Materials Science
ISSN
ISI:A1997XM07400017
Keywords :
Composition dependence , discontinuous magnetization , CuxFe3-xO4+delta
Abstract:
The spinel series CuxFe3-xO4+delta,0 less than or equal to delta less than or equal to 0.4 (where x = 0.2, 0.3, 0.4, 0.5, 0.6, 0.8 and 1.0) has been investigated by means of X-ray diffraction and Barkhausen jumps. Analysis of X-ray intensity data showed that this system separates into two phases at x < 1. The percentage of phase separation decreases with increasing copper content. The system shows a single phase at x = 1. The mean potential difference, V-B, and the frequency, F-B, of Barkhausen jumps were measured as a function of the magnetizing current. Addition of copper enhances the irreversible motion of domain walls. The sample with x = 1 shows the highest values of V-B and F-B. The potential energy of the walls increases with increasing copper content.
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