Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.1827911
Title: Microwave permeability of Co2 Z composites
Authors: Rozanov, K.N.
Li, Z.W. 
Chen, L.F. 
Koledintseva, M.Y.
Issue Date: 1-Jan-2005
Citation: Rozanov, K.N., Li, Z.W., Chen, L.F., Koledintseva, M.Y. (2005-01-01). Microwave permeability of Co2 Z composites. Journal of Applied Physics 97 (1) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.1827911
Abstract: The microwave permittivity and permeability of Co2 Z barium ferrite composite samples are measured as functions of frequency and volume fraction of the ferrite. Magnetostatic properties of the bulk ferrite are determined. This allows Snoek's law [J. L. Snoek, Physica 14, 204 (1948)] to be verified by comparing the microwave and magnetostatic Snoek's constants. The modification of Snoek's law for hexagonal ferrites suggested recently by Acher [Phys. Rev. B 62, 11324 (2000)] is also verified. Acher's constant is found from microwave measurements to agree with the value calculated from the magnetostatic properties of bulk ferrite, but microwave and magnetostatic Snoek's constant do not agree. This may be attributed to the effect due to demagnetizing factors of ferrite inclusions that are not considered in the derivation of Snoek's and Acher's laws. The measured frequency-dependent permeability of composites satisfies the Lorentzian dispersion law and is consistent with the Maxwell Garnett approximation [J. C. Maxwell Garnett, Philos. Trans. R. Soc. London 203, 385 (1904)]. According to the theoretical analysis based on the Lorentzian dispersion law and the Maxwell Garnet mixing rule, both Snoek's and Acher's constants must be linear functions of the volume fraction, independent of whether microwave values of the constants are in agreement with the magnetostatic values. In contrast, the experimental measurements reveal a steady decrease of both constants with the volume fraction. The disagreement is discussed in terms of the influence of effective medium in composite on the inherent permeability of ferrite particles. © 2005 American Institute of Physics.
Source Title: Journal of Applied Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/111433
ISSN: 00218979
DOI: 10.1063/1.1827911
Appears in Collections:Staff Publications

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

SCOPUSTM   
Citations

79
checked on Jul 17, 2018

WEB OF SCIENCETM
Citations

66
checked on Jun 27, 2018

Page view(s)

22
checked on Feb 25, 2018

Google ScholarTM

Check

Altmetric


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