Morphology dependence of static magnetic and microwave electromagnetic characteristics of polymorphic Fe_3O_4 nanomaterials
Morphology dependence of static magnetic and microwave electromagnetic characteristics of polymorphic Fe_3O_4 nanomaterials
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DOI：
10.1557/jmr.2011.131
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发表时间：
2011-07
影响因子：
2.7
通讯作者：
Guoxiu Tong;Wen-hua Wu;Ru Qiao;Jinhao Yuan;Jianguo Guan;H. Qian
中科院分区：
文献类型：
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作者：
Guoxiu Tong;Wen-hua Wu;Ru Qiao;Jinhao Yuan;Jianguo Guan;H. Qian
本工作制备了Fe_3O_4纳米球、海绵和海胆。对多晶型 Fe_3O_4 纳米材料的静磁和微波电磁（EM）特性的研究表明，形貌在决定其性能方面起着至关重要的作用。与Fe_3O_4纳米球和海胆相比，在由有序纳米纤维组成的Fe_3O_4海绵中观察到增强的饱和磁化强度和矫顽力。饱和磁化强度和矫顽力的增强分别与磁相互作用和形状各向异性的增加相关。 Fe_3O_4 海绵和海胆在 8.0 GHz 时产生的反射损耗 (R _L) 值分别为 -35.77 dB，在 16.8 GHz 时产生的反射损耗 (R_L) 值为 -43.23 dB。优异的微波吸收性能归因于其独特的形态。这种形态导致增强的电磁参数和多共振行为。
In the present work, Fe_3O_4 nanospheres, sponges, and urchins were prepared. Investigation of static magnetic and microwave electromagnetic (EM) characteristics of polymorphic Fe_3O_4 nanomaterials showed that morphology plays a crucial role in determining the resulting properties. Compared with Fe_3O_4 nanospheres and urchins, enhanced saturation magnetization and coercivity were observed in Fe_3O_4 sponges composed of ordered nanofibers. Enhancement of saturation magnetization and coercivity are associated with increased magnetic interactions and shape anisotropy, respectively. The Fe_3O_4 sponges and urchins produced reflection loss ( R _L) 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.