Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 322, Issue 15, Pages 2167-2171Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2010.02.003
Keywords
Microwave absorption; Nanoparticle; Magnetic loss
Funding
- National Natural Science Foundation of China [20801009]
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Magnetite nanoparticles are found to assemble into randomly dispersed loose nanoscale spheres with diameters similar to 300 nm in ethylene glycol in the presence of polyethylene and a small quantity of polyethyleneimine. Modernanalysismethodsareemployedtoprovidestructureinformationofthe magnetic loose spheres. The ferromagnetic saturation magnetization is similar to 80.0 emu g(-1), and the coercive force is 209 Oe. The microwave electromagnetic parameters are measured by a vector network analyzer. The synthesized loose spheres exhibit novel microwave properties compared with the conventional Fe3O4 nanoparticles. An additional microwave loss peak appears in the Ku band, which is attributed to the loose structure. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
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