Exchange Bias, Memory and Freezing Effects in NiFe2O4 Nanoparticles

Single-phase NiFe 2 O 4 nanoparticles embedded in SiO 2 matrix have been synthesized by sol-gel method. Average particle size lies in the range 8–12 nm. Magnetic measurements are taken by SQUID-magnetometer with a maximum applied field of ±7 T and temperature down to 4.2 K. An exchange bias effect i...

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Bibliographic Details
Published in:Journal of superconductivity and novel magnetism 2011-01, Vol.24 (1-2), p.717-720
Main Authors: Nadeem, K., Krenn, H.
Format: Article
Language:English
Subjects:
Anisotropy
Bias
Characterization and Evaluation of Materials
Coercive force
Condensed Matter Physics
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Freezing
Law
Magnetic Materials
Magnetic properties and materials
Magnetic properties of nanostructures
Magnetism
Nanoparticles
Original Paper
Particle size
Physics
Physics and Astronomy
Silicon dioxide
Strongly Correlated Systems
Superconductivity
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Summary:Single-phase NiFe 2 O 4 nanoparticles embedded in SiO 2 matrix have been synthesized by sol-gel method. Average particle size lies in the range 8–12 nm. Magnetic measurements are taken by SQUID-magnetometer with a maximum applied field of ±7 T and temperature down to 4.2 K. An exchange bias effect in nanoparticles is due to the existence of strong core-shell interactions and it vanishes as the particle size decreases (
ISSN:1557-1939
1557-1947
DOI:10.1007/s10948-010-0943-1