Challenge of ultra high frequency limit of permeability for magnetic nanoparticle assembly with organic polymer-Application of superparamagnetism
Challenge of ultra high frequency limit of permeability for magnetic nanoparticle assembly with organic polymer-Application of superparamagnetism
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DOI：
10.1016/j.jmmm.2008.11.041
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发表时间：
2009-04-01
影响因子：
2.7
通讯作者：
Takahashi, Migaku
中科院分区：
文献类型：
--
作者：
Hasegawa, Daiji;Yang, Haitao;Takahashi, Migaku
对超顺磁性纳米颗粒型磁介电混合材料的磁导率及其上限频率进行了理论和实验研究。Landau-Lifschitz-吉尔伯特方程表明，在没有纳米颗粒间相互作用的情况下，通过减小颗粒尺寸，阻塞共振频率能够超过源于本征磁晶各向异性场的铁磁共振频率，导致超顺磁矩在GHz范围内的超快速切换。在Fe纳米颗粒的情况下，通过将颗粒尺寸减小到1 nm，可以将阻断共振频率增加到130 GHz。Fe 3 O 4和Fe纳米粒子组装体的实验结果支持了计算结果的正确性。因此，超顺磁性纳米粒子组装体可能是用于超过10 GHz范围的高频使用的有前途的材料。(C)2008年由Elsevier B出版。诉
Permeability and its upper limitation frequency of superparamagnetic nanoparticle type magneto-dielectric hybrid material were theoretically and experimentally investigated. The Landau-Lifschitz-Gilbert equation without any interaction between nanoparticles revealed that the blocking resonance frequency was able to exceed the ferromagnetic resonance frequency originating from the intrinsic magnetocrystalline anisotropy field by decreasing particle size, resulting in ultra fast switching of superparamagnetic moment in GHz range. In the case of Fe nanoparticles, the blocking resonance frequency can be increased to 130 GHz by reducing particle size to 1 nm. The experiment results for Fe3O4 and Fe nanoparticle assemblies supported the validity of our calculation results. Thus, superparamagnetic nanoparticle assembly could be promising material for high frequency use over 10 GHz range. (C) 2008 Published by Elsevier B. V.