High frequency study of core-shell reusable CoFe2O 4-ZnO nanospheres
Recently, coated nanoshells combined with magnetic nanoparticles and cancer-cell-specific antibodies have been used to develop a multifunctional platform for simultaneously diagnosing and treating cancer, via magnetic resonance imaging and photothermal therapy. For this application, core-shell nano-spheres with a low resonance frequency (low GHz range) in a strong applied field are required. In this aspect, ferromagnetic resonance experiment is an important tool for determining the dynamic properties of nano-materials. Magnetic field dependence of resonance frequency (fr) and linewidths (Δ and ΔH) for both the ZnO coated and uncoated CoFe 2O4 hollow spheres are studied using a vector network analyzer. As compared to uncoated CoFe2O4 hollow sphere, ZnO coated CoFe2O4 showed reduced resonance frequency, larger Δ and ΔH, reduced gyromagnetic ratio and effective fields. The experimental results are confirmed with the effective medium theory. © 2014 AIP Publishing LLC.
Journal of Applied Physics
Kuanr, B., Veerakumar, V., Mishra, S., Wilson, A., Kuanr, A., Camley, R., & Celinski, Z. (2014). High frequency study of core-shell reusable CoFe2O 4-ZnO nanospheres. Journal of Applied Physics, 115 (17) https://doi.org/10.1063/1.4866081