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Title: Synthesis, structure and dynamic magnetic properties of double-layered Ni-Fe1-xCox hollow microspheres
Authors: Phua, L.X.
Liu, Z.W. 
Ong, C.K. 
Issue Date: 7-Jan-2008
Citation: Phua, L.X., Liu, Z.W., Ong, C.K. (2008-01-07). Synthesis, structure and dynamic magnetic properties of double-layered Ni-Fe1-xCox hollow microspheres. Journal of Physics D: Applied Physics 41 (1) : -. ScholarBank@NUS Repository.
Abstract: Double-layered Ni-Co1-xFex hollow microspheres with a mean size of ∼1 νm were fabricated by electroless plating of Co or Co-rich CoFe films on Ni hollow spheres (HS); the latter was synthesized by an autocatalytic reaction process. The Ni HS have a microstructure consisting of both fcc and hcp phases and have a very low coercivity. Coating a layer of Co leads to a high coercivity due to the formation of the hcp Co phase with high magnetocrystal anisotropy. Addition of 10% Fe into the Co layer decreases the coercivity from 432 to 140 Oe by transforming the hcp Co phase to the fcc CoFe phase; the latter has a low anisotropy field. Addition of 20% Fe results in a further decrease in coercivity to 69 Oe due to the formation of the bcc CoFe phase. The microwave properties of the composites consisting of HS and a polymer were investigated. Ni HS + a polymer composite have high permittivity but relatively low permeability. Co or CoFe coating decreases the permittivity but slightly increases the permeability of the composite. A reflection loss of
Source Title: Journal of Physics D: Applied Physics
ISSN: 00223727
DOI: 10.1088/0022-3727/41/1/015001
Appears in Collections:Staff Publications

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