Magnetic and optical properties of γ-Fe2O3 nanocrystals

γ-Fe2O3 nanocrystals have been synthesized in a polymer matrix by an ion exchange and precipitation reaction. The particles are crystalline with a mean diameter of 85 Å. The unit cell volume is 1735.2 Å3 corresponding to a unit cell compression of 0.35%. Magnetization and susceptibility data from ex...

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Bibliographic Details
Published in:Journal of applied physics 1993-05, Vol.73 (10), p.5109-5116
Main Authors: VASSILIOU, J. K, VIVEK MEHROTRA, RUSSELL, M. W, GIANNELIS, E. P, MCMICHAEL, R. D, SHULL, R. D, ZIOLO, R. F
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic properties and materials
Physics
Studies of specific magnetic materials
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Summary:γ-Fe2O3 nanocrystals have been synthesized in a polymer matrix by an ion exchange and precipitation reaction. The particles are crystalline with a mean diameter of 85 Å. The unit cell volume is 1735.2 Å3 corresponding to a unit cell compression of 0.35%. Magnetization and susceptibility data from experiment and computer simulations indicate that the system is superparamagnetic. The calculated magnetic anisotropy for the particles is two orders of magnitude larger than that of bulk γ-Fe2O3 . The optical absorption edge is red shifted with respect to that of an epitaxially grown single-crystal film of γ-Fe2O3 . The red shift is attributed to lattice strain in the small particles.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.353784