Challenge of ultra high frequency limit of permeability for magnetic nanoparticle assembly with organic polymer-Application of superparamagnetism

被引：51

作者：

Hasegawa, Daiji ^{[1
]}

Yang, Haitao ^{[2
,3
]}

Ogawa, Tomoyuki ^{[4
]}

Takahashi, Migaku ^{[1
,3
]}

机构：

[1] Tohoku Univ, Dept Elect Engn, Aoba Ku, Sendai, Miyagi 9808579, Japan

[2] Japan Soc Promot Sci, Aoba Ku, Sendai, Miyagi 9808579, Japan

[3] Tohoku Univ, New Ind Creat Hatchery Ctr, Aoba Ku, Sendai, Miyagi 9808579, Japan

[4] Tohoku Univ, Ctr Res Strategy & Support, Aoba Ku, Sendai, Miyagi 9808579, Japan

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2009年 / 321卷 / 07期

基金：

日本学术振兴会;

关键词：

Magnetic nanoparticle; Superparamagnetic; Permeability; Blocking resonance; High frequency;

D O I：

10.1016/j.jmmm.2008.11.041

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：746 / 749

页数：4

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