AN IMPROVED MEAN-FIELD THEORY FOR MIXED SPINEL FERRITES

Authors
TANG IM VARAMIT S
Citation
Im. Tang et S. Varamit, AN IMPROVED MEAN-FIELD THEORY FOR MIXED SPINEL FERRITES, Journal of magnetism and magnetic materials, 150(1), 1995, pp. 93-100
Citations number
12
Categorie Soggetti
Material Science","Physics, Condensed Matter
Journal title
Journal of magnetism and magnetic materials → ACNP
ISSN journal
03048853
Volume
150
Issue
1
Year of publication
1995
Pages
93 - 100
Database
ISI
SICI code
0304-8853(1995)150:1<93:AIMTFM>2.0.ZU;2-D
Abstract
The standard mean field approach neglects the random disordering of ma gnetic and nonmagnetic ions with the sublattice of the mixed-spinel fe rrites. It is known that this disordering can lead to real effects. A mean field theory is developed in which local field fluctuations arisi ng from the random disordering of the magnetic ions within a sublattic e acts on the spins located within the other sublattice. It is seen th at the fluctuations lead to a lowering of the values of the spins at i ntermediate temperatures.