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

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Author(s): Cheng YL | Dai JM | Zhu XB | Wu DJ | Yang ZR | Sun YP

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 4;
Issue: 10;
Start page: 1153;
Date: 2009;
Original page

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

ABSTRACT
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.
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