High frequency study of core-shell and uncoated Fe3O4 nanoparticles

Autor:	Alka V. Kuanr, R. E. Camley, Zbigniew Celinski, Kiran Lingam, Bijoy K. Kuanr, Sanjay R. Mishra, V. Veerakumar
Rok vydání:	2012
Předmět:	Laser linewidth Nanolithography Materials science Physics::Optics General Physics and Astronomy Nanoparticle Particle Nanotechnology Particle size Composite material Absorption (electromagnetic radiation) Ferromagnetic resonance Magnetic field
Zdroj:	Journal of Applied Physics. 111:07B542
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.3682371
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a8e582f0f4be092c87229ba45ec25b8a https://doi.org/10.1063/1.3682371 Zobrazit plný text záznamu