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- Title
Exceeding natural resonance frequency limit of monodisperse Fe<sub>3</sub>O<sub>4</sub> nanoparticles via superparamagnetic relaxation.
- Authors
Ning-Ning Song; Hai-Tao Yang; Hao-Liang Liu; Xiao Ren; Hao-Feng Ding; Xiang-Qun Zhang; Zhao-Hua Cheng
- Abstract
Magnetic nanoparticles have attracted much research interest in the past decades due to their potential applications in microwave devices. Here, we adopted a novel technique to tune cut-off frequency exceeding the natural resonance frequency limit of monodisperse Fe3O4 nanoparticles via superparamagnetic relaxation. We observed that the cut-off frequency can be enhanced from 5.3 GHz for Fe3O4 to 6.9 GHz for Fe3O4@SiO2 core-shell structure superparamagnetic nanoparticles, which are much higher than the natural resonance frequency of 1.3 GHz for Fe3O4 bulk material. This finding not only provides us a new approach to enhance the resonance frequency beyond the Snoek's limit, but also extend the application for superparamagnetic nanoparticles to microwave devices.
- Subjects
NANOPARTICLES; SUPERPARAMAGNETIC materials; RELAXATION phenomena; MICROWAVE devices; BULK solids
- Publication
Scientific Reports, 2013, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep03161