High frequency study of core-shell and uncoated Fe3O4 nanoparticles

Nanoparticles of Fe3O4 (core) were synthesized and some were covered with a thin layer of Au (shell) to create a core-shell structure. The dynamic magnetic properties were studied using a vector network analyzer. It was found that, at a given applied magnetic field, the core-shell nanoparticles reso...

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Bibliographic Details
Published in:Journal of applied physics 2012-04, Vol.111 (7)
Main Authors: Kuanr, Bijoy K., Veerakumar, V., Kuanr, Alka V., Lingam, Kiran, Mishra, S. R., Camley, R. E., Celinski, Z.
Format: Article
Language:English
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Summary:Nanoparticles of Fe3O4 (core) were synthesized and some were covered with a thin layer of Au (shell) to create a core-shell structure. The dynamic magnetic properties were studied using a vector network analyzer. It was found that, at a given applied magnetic field, the core-shell nanoparticles resonate at lower frequency compared to the uncoated Fe3O4 nanoparticles and the resonance frequency increased with increasing applied field for both the core-shell and the uncoated nanoparticles. Also, the core-shell nanoparticles exhibited additional resonances. Further, the core-shell nanoparticles exhibited a larger linewidth compared to the uncoated counterparts for all the particle sizes. The experimental absorption data have been compared with the results obtained from an effective medium theory.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3682371