Size-dependent magnetic properties of nanocrystalline yttrium iron garnet powders

Yttrium iron garnet (YIG) powders with particle sizes of 9, 14, 25 and 60 nm have been synthesised and their magnetic properties have been studied as a function of particle size and temperature. The particles with sizes of 9 and 14 nm exhibited superparamagnetism. The blocking temperature ( T B ) de...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2006-06, Vol.301 (1), p.212-219
Main Authors: Rajendran, M., Deka, S., Joy, P.A., Bhattacharya, A.K.
Format: Article
Language:English
Subjects:
Anisotropy constant
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Diamagnetism, paramagnetism and superparamagnetism
Exact sciences and technology
Magnetic properties and materials
Magnetic properties of nanostructures
Magnetism
Nanoparticles
Physics
Superparamagnetism
YIG
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Summary:Yttrium iron garnet (YIG) powders with particle sizes of 9, 14, 25 and 60 nm have been synthesised and their magnetic properties have been studied as a function of particle size and temperature. The particles with sizes of 9 and 14 nm exhibited superparamagnetism. The blocking temperature ( T B ) decreased with decreasing particle size, whereas the anisotropy constant ( K) increased. The saturation magnetisation ( M s ) decreased with decreasing particle size. These variations are attributed to large surface-to-volume ratios in nanoparticles where the surface moments are predominant.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2005.06.027