Structural and Magnetic Properties of Ba-ferrite Fine Particles Grown by Glass Crystallization
Abstract
The dependence of the specific saturation magnetization on the particle size of pure and Co-Ti-substituted Ba-ferrites was interpreted in terms of a nonmagnetic surface layer parallel to the c-planes of 1.3 nm and 0.7 nm, respectively, in thickness. Electron microscope investigations of the particles demonstrate that this effect arises neither from a sufficient fraction of superparamagnetic particles in the ensemble nor from the Co-Ti substitution or from surface defects such as steps and stacking disorder of the building blocks. Extrapolating this surface effect to small sizes yields a critical size, with the particles losing their ferrimagnetic behaviour. This critical size agrees surprisingly well with the volume calculated for the transition of the single domain state to the superparamagnetic one. © 1991 Springer Verlag.
Recommended Citation
M. A. Rösler et al., "Structural and Magnetic Properties of Ba-ferrite Fine Particles Grown by Glass Crystallization," Zeitschrift für Physik D Atoms, Molecules and Clusters, Springer Verlag, Jan 1991.
The definitive version is available at https://doi.org/10.1007/BF01448311
Department(s)
Chemistry
International Standard Serial Number (ISSN)
0178-7683
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 1991 Springer Verlag, All rights reserved.
Publication Date
01 Jan 1991
