High frequency study of core-shell and uncoated Fe 3O 4 nanoparticles
Nanoparticles of Fe 3O 4 (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 Fe 3O 4 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. © 2012 American Institute of Physics.
Journal of Applied Physics
Kuanr, B., Veerakumar, V., Kuanr, A., Lingam, K., Mishra, S., Camley, R., & Celinski, Z. (2012). High frequency study of core-shell and uncoated Fe 3O 4 nanoparticles. Journal of Applied Physics, 111 (7) https://doi.org/10.1063/1.3682371