This work was supported by the CNRS (France) and the Ministry of Education of the Czech Republic under the framework Project No. LN00 A028. AH and DN thank the French Research Ministry for supporting grants.
High Coercive Field for Nanoparticles of CoFe2O4 in Amorphous Silica Sol–Gel†
Article first published online: 7 OCT 2003
Copyright © 2003 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Volume 15, Issue 19, pages 1622–1625, October, 2003
How to Cite
Hutlova, A., Niznansky, D., Rehspringer, J.-L., Estournès, C. and Kurmoo, M. (2003), High Coercive Field for Nanoparticles of CoFe2O4 in Amorphous Silica Sol–Gel. Adv. Mater., 15: 1622–1625. doi: 10.1002/adma.200305305
- Issue published online: 7 OCT 2003
- Article first published online: 7 OCT 2003
- Manuscript Accepted: 27 JUN 2003
- Manuscript Received: 23 APR 2003
- Magnetic hysteresis;
- Nanoparticles, magnetic;
Unusually high magnetic hardness, characterized by a coercive field of 2 T at 2 K, has been observed for 12 nm particles of CoFe2O4 (15%) in amorphous silica prepared by the sol–gel technique and sintered at 1000 °C. Field- and temperature-dependence magnetization data (see Figure) for these particles and those of 3.2 nm suggest that dipolar interaction between particles is responsible for this enhancement.