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Morphology dependence of static magnetic and microwave electromagnetic characteristics of polymorphic Fe3O4 nanomaterials

Published online by Cambridge University Press:  30 June 2011

Guoxiu Tong ,
Wenhua Wu ,
Ru Qiao ,
Jinhao Yuan ,
Jianguo Guan  and
Haisheng Qian
Guoxiu Tong*
Affiliation:
Zhejiang Key Laboratory for Reactive Chemistry on Solid Surface, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhu 321004, People’s Republic of China
Wenhua Wu
Affiliation:
Zhejiang Key Laboratory for Reactive Chemistry on Solid Surface, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhu 321004, People’s Republic of China
Ru Qiao
Affiliation:
Zhejiang Key Laboratory for Reactive Chemistry on Solid Surface, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhu 321004, People’s Republic of China
Jinhao Yuan
Affiliation:
Zhejiang Key Laboratory for Reactive Chemistry on Solid Surface, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhu 321004, People’s Republic of China
Jianguo Guan
Affiliation:
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, People’s Republic of China
Haisheng Qian
Affiliation:
Zhejiang Key Laboratory for Reactive Chemistry on Solid Surface, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhu 321004, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In the present work, Fe3O4 nanospheres, sponges, and urchins were prepared. Investigation of static magnetic and microwave electromagnetic (EM) characteristics of polymorphic Fe3O4 nanomaterials showed that morphology plays a crucial role in determining the resulting properties. Compared with Fe3O4 nanospheres and urchins, enhanced saturation magnetization and coercivity were observed in Fe3O4 sponges composed of ordered nanofibers. Enhancement of saturation magnetization and coercivity are associated with increased magnetic interactions and shape anisotropy, respectively. The Fe3O4 sponges and urchins produced reflection loss (RL) values of −35.77 dB at 8.0 GHz and −43.23 dB at 16.8 GHz, respectively. The excellent microwave absorption performance is ascribed to their unique morphologies. Such morphologies resulted in reinforced EM parameters and multiresonant behavior.

Keywords

Dielectric propertiesNanostructureMagnetic properties
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 13 , 14 July 2011 , pp. 1639 - 1645
Copyright
Copyright © Materials Research Society 2011

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