Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/5893
Title: Microwave complex permeability of Fe₃O₄ nanoflake composites with and without magnetic field-induced rotational orientation
Authors: Liu, X
Or, DSW 
Leung, CM
Ho, SL 
Keywords: Iron compounds
Liquid phase deposition
Magnetic permeability
Nanocomposites
Nanofabrication
Nanomagnetics
Waxes
Issue Date: 7-May-2013
Publisher: American Institute of Physics
Source: Journal of applied physics, 7 May 2013, v. 113, no. 17, 17B307, p. 1-3 How to cite?
Journal: Journal of applied physics 
Abstract: Magnetite (Fe₃O₄) nanoflakes with widths of 100–200 nm and thicknesses of 10–80 nm were prepared by a hydrothermal synthesis method. Fe₃O₄ nanoflake composites with and without magnetic field-induced rotational orientation of flake planes of Fe3O₄ nanoflakes in paraffin binder were fabricated using 35 wt. % Fe₃O₄ nanoflakes. The rotationally oriented composite showed higher permeability and resonance frequency than the nonoriented one, and its value of (μ₀−1)fr reached 214.8 GHz and exceeded the Snoek's limit. Considering a uniform and a random distribution of flake planes of Fe₃O₄ nanoflakes in the oriented and nonoriented composites, respectively, the complex permeability of both composites was calculated using the Landau–Lifshitz–Gilbert equation and the Bruggeman's effective medium theory in the 2–18 GHz microwave frequency range.
URI: http://hdl.handle.net/10397/5893
ISSN: 0021-8979
EISSN: 1089-7550
DOI: 10.1063/1.4798606
Rights: © 2013 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Xianguo Liu et al., J. Appl. Phys. 113, 17B307 (2013) and may be found at http://link.aip.org/link/?jap/113/17B307.
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