期刊
NANOSCALE RESEARCH LETTERS
卷 4, 期 10, 页码 1153-1158出版社
SPRINGEROPEN
DOI: 10.1007/s11671-009-9374-y
关键词
La0.6Sr0.4MnO3 nanoparticles; Core/shell structure; Microwave absorption; Electromagnetic matching
资金
- National Key Basic Research [2007CB925001, 2007CB925002]
- National Nature Science Foundation of China [10874051]
- Anhui NSF [070416233, KJ2007A084]
The intrinsically core/shell structured La0.6Sr0.4MnO3 nanoparticles 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 La0.6Sr0.4MnO3 nanoparticles with amorphous shells and ferromagnetic cores may become attractive candidates for the new types of electromagnetic wave absorption materials.
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