Effect of Organic Fuel on High-Frequency Magnetic Properties of Fe-Al2O3 Composite Powders Synthesized by a Combustion Method
- Authors
- Choi, Donchul; Choi, Moosung; Kim, Jongryoul
- Issue Date
- Nov-2015
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Combustion; Fe-Al2O3 composite powders; high-frequency soft-magnetic property; soft-magnetic composite
- Citation
- IEEE TRANSACTIONS ON MAGNETICS, v.51, no.11, pp.1 - 4
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON MAGNETICS
- Volume
- 51
- Number
- 11
- Start Page
- 1
- End Page
- 4
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/16599
- DOI
- 10.1109/TMAG.2015.2441115
- ISSN
- 0018-9464
- Abstract
- Nanocrystalline Fe-Al2O3 soft-magnetic composite powders were synthesized by a conventional combustion method followed by a H-2 reduction process. In this paper, we analyzed the effect of the types and compositions of organic fuel on the dispersive magnetic properties of the composite powders for improving the soft-magnetic properties. To understand the properties, the microstructural and thermal characterization of as-synthesized oxide powders and their reduced powders were analyzed by an X-ray diffractor, a scanning electron microscope, and a thermogravimetric and differential thermal analyzer. In addition, the high-frequency dispersive magnetic simulation using the Landau-Lifshitz-Gilbert (LLG) equation and extended Maxwell-Garnet effective medium theory mixing rule was carried out. As a result, the microstructural and thermal analyses showed that the high-frequency dispersive magnetic behaviors of nanocrystalline Fe-Al2O3 composite powders were dependent on the types and the compositions of fuel by controlling the released heat amount during the combustion redox reaction. In particular, a relative real permeability (u(r)') of 3.6 at 1 GHz was obtained in Fe-Al2O3 (Fe: Al = 95: 5, wt%) composite powders combusted by a mixed fuel composed of a 50 mol% glycine and a 50 mol% urea.
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