Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 323, Issue 6, Pages 864-867Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2010.11.068
Keywords
Magnetodielectric coupling; Nanocomposites; Cobalt oxide; Silica glass
Funding
- DST, Government of India, New Delhi
- DST
- Indian National Science Academy, New Delhi
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Co3O4 nanocrystals of sizes in the range 17.5-33.1 nm were grown within a sol-gel-derived silica glass matrix. Rietveld analysis of the X-ray diffraction data showed that the crystals had tetragonal symmetry. This was explained as arising due to a tensile strain induced at the glass-crystal interface as a result of thermal expansion mismatch between the phases. The crystals showed ferromagnetic behaviour with superparamagnetism setting-in at temperatures above 15 K. They also exhibited ferroelectric characteristics with large remanent polarization. Change in dielectric constant as a function of magnetic field was observed in these nanocomposites. This was discussed on the basis of magnetostriction effect. (C) 2010 Elsevier B.V. All rights reserved.
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