Please use this identifier to cite or link to this item:
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

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Dec 4, 2020


checked on Nov 25, 2020

Page view(s)

checked on Nov 29, 2020

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.