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Open Access Nano Express

Enhanced Microwave Absorption Properties of Intrinsically Core/shell Structured La0.6Sr0.4MnO3Nanoparticles

YL Cheng1, JM Dai2*, XB Zhu1, DJ Wu1, ZR Yang1 and YP Sun1

Author Affiliations

1 Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, 230031, Hefei, People’s Republic of China

2 School of Physics and Electronic Information, Huaibei Coal Industry Teachers College, 235000, Huaibei, People’s Republic of China

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Nanoscale Research Letters 2009, 4:1153-1158  doi:10.1007/s11671-009-9374-y

Published: 17 June 2009

Abstract

The intrinsically core/shell structured La0.6Sr0.4MnO3nanoparticles with amorphous shells and ferromagnetic cores have been prepared. The magnetic, dielectric and microwave absorption properties are investigated in the frequency range from 1 to 12 GHz. An optimal reflection loss of −41.1 dB is reached at 8.2 GHz with a matching thickness of 2.2 mm, the bandwidth with a reflection loss less than −10 dB is obtained in the 5.5–11.3 GHz range for absorber thicknesses of 1.5–2.5 mm. The excellent microwave absorption properties are a consequence of the better electromagnetic matching due to the existence of the protective amorphous shells, the ferromagnetic cores, as well as the particular core/shell microstructure. As a result, the La0.6Sr0.4MnO3nanoparticles with amorphous shells and ferromagnetic cores may become attractive candidates for the new types of electromagnetic wave absorption materials.

Keywords:
La0.6Sr0.4MnO3nanoparticles; Core/shell structure; Microwave absorption; Electromagnetic matching