Study of Microstructure and Magnetic Properties of SrM Hexaferrites with Neodymium Oxide

• Published in: Journal of superconductivity and novel magnetism 2011-11, Vol.24 (8), p.2325-2329
• Main Authors: Pérez-Juache, T. J., Betancourt, I., Palomares-Sánchez, S. A., Mirabal García, M., Matutes-Aquino, J. A., Guerrero-Serrano, A. L.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Coercive force; Coercivity; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Curie temperature; Domain effects, magnetization curves, and hysteresis; Exact sciences and technology; Magnetic Materials; Magnetic properties; Magnetic properties and materials; Magnetism; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; Microstructure; Neodymium; Original Paper; Oxides; Permanent magnets; Physics; Physics and Astronomy; Strongly Correlated Systems; Studies of specific magnetic materials; Superconductivity
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/s10948-011-1193-6

In this work, we report a systematic study on the microstructure and magnetic properties of isotropic M-type SrNd x Fe 12− x O 19 hexaferrites ( x =0.0, 0.1, 0.2, 0.3, 0.4, 0.5) obtained by conventional ceramic process. According to DRX analysis, a solid solution is formed for Nd contents up to x =0.1, while a composite Sr(NdFe) 12 O 19 /SrFeO 3 microstructure results for x >0.1. Interesting combinations of hard magnetic properties were obtained for the whole compositional series including increasing coercivity values (up to 329 kA/m for x =0.5) with increasing Nd concentration, together with high Curie temperatures (around 731 K). Results are interpreted in terms of the Nd incorporation into the unit cell as well as within the frame of the nucleation controlled mechanism as the coercivity source for this kind of materials.