Materials Transactions Online

Materials Transactions, Vol.52 No.04 (2011) pp.740-745
© 2011 The Japan Institute of Metals

Microwave Absorption Properties of Polymer Modified Ni-Zn Ferrite Nanoparticles

Kazuaki Shimba, Kiyotaka Furuta, Nobuyuki Morimoto, Nobuki Tezuka and Satoshi Sugimoto

Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-02 Aoba-yama, Sendai 980-8579, Japan

Polymer composites of magnetic particles are widely used as microwave absorbers. An effective method for obtaining thinner microwave absorbers for device design is increasing the volume fraction of magnetic nanoparticles by enhancing the permeability of composites. In this study, composites were prepared using Ni-Zn ferrite nanoparticles surface-modified with 4-META (4-methacryloylioxyethyl trimellitate anhydride) and cross-linked with PEG-4SH (pentaerythritol tetra-polyethylene glycol ether with four thiol-modified terminals). These composites have a high volume fraction of nanoparticles (up to 72 vol%) and permeability (μr max'' = 5.9). In addition, the prepared composites showed good microwave absorption properties (R.L. < -20 dB) with a smaller matching thickness than conventional microwave absorber using spinel-type ferrite.

(Received 2010/10/21; Accepted 2011/1/18; Published 2011/3/2)

Keywords: magnetic nanoparticles, nickel-zinc ferrite, surface modification, cross-linking, microwave absorbers

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