Solution synthesis and novel magnetic properties of ball-chain iron nanofibers.

Autor: Guoxiu Tong, Wenhua Wu, Jianguo Guan, Jianping Wang, Ji Ma, Jinhao Yuan, Sunli Wang
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Zdroj: Journal of Materials Research; 10/28/2011, Vol. 26 Issue 20, p2590-2598, 9p
Abstrakt: The current work describes the simple solution process of ball-chain polycrystalline Fe nanofibers with aspect ratios (λ) and diameters (D) of over 1-65 and 30-95 nm. Static magnetic and k microwave electromagnetic property studies demonstrated that such properties strongly depend on the λ and D of the Fe nanofibers. As the λ and D increase, the U-shape of the saturation magnetization (Ms) reaches a maximum of 180.0 emu⋅g-1, owing to the cooperative action of nanoeffects and magnetic interactions, whereas the coercivity (Hc) gradually increases due to aspect ratio variations. In contrast, the change in trends of the permittivity (ε', ε") and the dielectric loss (tgδE) are represented as an inverted U-shape; the permeability (μ', μ") and magnetic loss (tgδM) increase at low-frequency ranges and decrease at high frequency ranges. Stronger absorption and broader bandwidths of Fe nanofibers compared with Fe nanoparticles are ascribed to higher dielectric losses. The prepared Fe nanofibers have high potential in light-weight and broad bandwidth microwave absorbing applications. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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