Exceeding natural resonance frequency limit of monodisperse Fe(3)O(4) nanoparticles via superparamagnetic relaxation.

Exceeding natural resonance frequency limit of monodisperse Fe(3)O(4) nanoparticles via superparamagnetic relaxation.
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通过超顺磁弛豫超越单分散 Fe3O4 纳米颗粒的自然共振频率极限

DOI:
10.1038/srep03161
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发表时间:
2013-11-07
期刊:
影响因子:
4.6
通讯作者:
Cheng ZH
Cheng ZH
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Song NN;Yang HT;Liu HL;Ren X;Ding HF;Zhang XQ;Cheng ZH

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磁性纳米粒子由于其在微波器件中的潜在应用,在过去的几十年里引起了人们的广泛研究兴趣。在这里,我们采用了一种新的技术,通过超顺磁弛豫调谐截止频率超过单分散Fe3O4纳米粒子的自然共振频率极限。我们观察到,Fe3O4@SiO2核壳结构超顺磁性纳米粒子的截止频率可以从Fe3O4的5.3 GHz提高到6.9 GHz,远高于Fe3O4块体材料的自然共振频率1.3 GHz.   这一发现不仅为提高超顺磁性纳米粒子的共振频率提供了一种新的途径,而且将超顺磁性纳米粒子的应用扩展到微波器件中。
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 forFe3O4@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.
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