Sage Journals: Discover world-class research

Abstract

Materials that contain both an electric permittivity and magnetic permeability greater than unity (magneto-dielectrics) are currently being investigated for microwave applications. Magneto-dielectric composite materials based upon flake-like iron inclusions were fabricated and the iron flakes oriented within a low loss thermoplastic host. The electrical and magnetic properties of the magneto-dielectric composites were predicted using mean field and effective medium approximations, as well as the Wu—McCullough generalized transport model. Predicted values were compared to measured properties as a function of the filler’s aspect ratio, surface characteristics and volume fraction. The Wu—McCullough model was found to be the most accurate in predicting the transport properties, but required an accurate description of the microstructure (flake aspect ratio and alignment).

Keywords

magneto-dielectric composite high-aspect ratio filler ferromagnetic flakes.

References

Mano, Y. and Bae, S. ( 2005). A Small Meander Antenna by Magneto-dielectric Material, Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, MAPE 2005, IEEE International Symposium on 2005.

Mosallaei, H. and Sarabandi, K. ( 2004). Engineered Meta-substrates for Antenna Miniaturization , In: Proc. URSI Int. Symp. Electromagn. Theory , Pisa, Italy, 23-27 May, pp. 191-193.

Karkkainen, M. and Ikonen, P. (2005). Patch Antenna with Stacked Split-ring Resonators as Artificial Magneto-dielectric Substrate, Microwave Optical Technology Letter, 46(6): 554-556.

Mirza, I.O. , Shi, S. , Fazi, C. , Mait, J.N. and Prather, D.W. ( 2007). A Study of Loop Antenna Miniaturization Using Split Ring Resonators, In: Antennas and Propagation International Symposium, 2007 IEEE, 9-15 June 2007, pp. 1865-1868.

Ikonen, P.M.T. , Rozanov, K.N. , Osipov, A.V. , Alitalo, P. and Tretyakov, S.A. (2006). Magnetodielectric Substrates in Antenna Miniaturization: Potential and Limitations, IEEE Transactions on Antennas and Propagations, 54(11): 3391-3399.

Hale, D.K. ( 1976). Physical-Properties of Composite-Materials, Journal of Materials Science, 11(11): 2105-2141.

Stratton, J.A. ( 1941). Electromagnetic Theory, 1st edn, International Series in Physics, McGraw-Hill, New York, London .

Osborn, J.A. (1945). Demagnetizing Factors of the General Ellipsoid, Physical Review, 67(1-11): 351-357.

Bozorth, R.M. ( 1951). Ferromagnetism, Bell Telephone Laboratories Series, Van Nostrand, New York.

10.

Chikazumi, S. , Graham, C.D. and Chikazumi , S. (1997). Physics of Ferromagnetism, 2nd edn, Clarendon Press, Oxford University Press, Oxford, New York.

11.

Perrin, J. , Despax, B. and Kay, E. ( 1985). Optical-Properties and Microstructure of Gold Fluorocarbon-Polymer Composite Films. Physical Review B, 32(2): 719-732.

12.

Polder, D. and Vansanten, J.H. ( 1946). The Effective Permeability of Mixtures of Solids, Physica, 12(5): 257-271.

13.

Sturman Jr, P.C. (1990). Low-frequency Electrical Behavior of Dilute Conducting Fiber Composites, University of Delaware, United States, Delaware.

14.

Banhegyi, G. (1986). Comparison of Electrical Mixture Rules for Composites, Colloid and Polymer Science , 264(12): 1030-1050.

15.

Wu, C.T.D. and McCullough, R.L. (1979). Constitutive Relationships for Heterogenous Materials, In: Holister, G.S. (ed.), Developments in Composite Materials, Applied Science Publishers, London.

16.

McCullough, R.L. and Quigley, J.J. (1982). Transport Properties of Composite Materials: 1, Electrical Conductivity, Storming Media, p. 168.

17.

Berger, M.A. ( 1984). Electrical behavior of metalloplastics, M.ChE. Thesis , Department of Chemical Engineering, University of Delaware .

18.

Berger, M.A. and McCullough, R.L. (1985). Characterization and Analysis of the Electrical-Properties of a Metal-Filled Polymer. Composites Science and Technology, 22(2): 81-106.

19.

Zhao, Y.W. , Zhang, X.K. and Xiao, J.Q. ( 2005). Submicrometer Laminated Fe/SiO2 Soft Magnetic Composites-An Effective Route to Materials for High-frequency Applications, Advanced Materials, 17(7): 915-918.

Magnetic and Dielectric Properties of Materials Consisting of Oriented,Iron Flake Filler within a Thermoplastic Host: Part II Transport Model Review and Evaluation

Abstract

Keywords

References