Low-Loss Co2-Y Ferrites with Added CuO Sintered in Air for High Frequency Application


The sintering characteristics of hexagonal Co2-Y-type ferrite, Ba2Co2Fe12O22, with the addition of 0.6 wt% CuO, were studied in order to allow for preparation in air, as opposed to the conventionally recommended O2, for industrial production. The dependence of the resistivity, ρ magnetic loss, tanδ, and the permeability, μ, at 1 GHz on the sintering temperature was investigated. A low tanδ of 0.05 with a m of 2.7 at a frequency of 1 GHz, along with a high ρ (up to 7 × 104 μm), were attained under sintering at 1170°C in air, which were the same features as those of samples sintered at 1200°C in O2. The dependence of tanδ on grain diameter was also examined, and it was determined that a small grain size (less than 2 μm) is preferable for low tanδ.

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Fujii, S. , Wakamatsu, K. , Satoh, H. and Yamamoto, S. (2014) Low-Loss Co2-Y Ferrites with Added CuO Sintered in Air for High Frequency Application. Materials Sciences and Applications, 5, 984-989. doi: 10.4236/msa.2014.513099.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Pardavi-Horvath, M. (2001) Microwave Applications of Soft Ferrite. Journal of Magnetism and Magnetic Materials, 215-216, 171-183.
[2] Harris, V.G., Geiler, A., Chen, Y., Yoon, S. D., Wu, M., Yang, A., Chen, Z., He, P., Parimi, P. V., Zuo, X., Patton, C. E., Abe, M., Acher, O. and Vittoria, C. (2009) Recent Advances in Processing and Applications of Microwave Ferrites. Journal of Magnetism and Magnetic Materials, 321, 2035-2047.
[3] Harris, V.G. (2012) Modern Microwave Ferrites. IEEE Transactions on Magnetics, 48, 1075-1104.
[4] Zuo, X., How, H., Shi, P., Oliver, S.A. and Vittoria, C. (2001) Development of High Frequency Ferrite Phase-Shifter. IEEE Transactions on Magnetics, 37, 2395-2397.
[5] Wang, J.W., Geiler, A.L., Harris, V.G. and Vittoria, C. (2010) Numerical Simulation of Wave Propagation in Yand Z-Type Hexaferrites for High Frequency Applications. Journal of Applied Physics, 107, Article ID: 09A515.
[6] Singh, P., Babbar, V.K., Razdan, A., Srivastava, S.L. and Puri, R.K. (1999) Complex Permeability and Permittivity, and Microwave Absorption Studies of Ca(CoTi)xFe12-2xO19 Hexaferrite Composites in X-band Microwave Frequencies. Materials Science and Engineering: B, B67, 132-138.
[7] Snoek, L.L. (1948) Dispersion and Absorption in Magnetic Ferrites at Frequencies above One Mc/s. Physica, 14, 207217.
[8] Nakamura, T. (2000) Snoek’s Limit in High-Frequency Permeability of Polycrystalline Ni-Zn, Mg-Zn, and Ni-Cu-Zn Spinel Ferrites. Journal of Applied Physics, 88, 348-353.
[9] Nakamura, T. and Hatakeyama, K. (2000) Complex Permeability of Polycrystalline Hexagonal Ferrites. IEEE Transactions on Magnetics, 36, 3415-3417.
[10] Obol, M. and Vittoria, C. (2003) Measurement of Permeability of Oriented Y-Type Hexaferrites. Journal of Magnetism and Magnetic Materials, 265, 290-295.
[11] Lee, S.G. and Kwon, S.J. (1996) Saturation Magnetizations and Curie Temperatures of Co-Zn Y-Type Ferrites. Journal of Magnetism and Magnetic Materials, 153, 279-284.
[12] How, H., Zuo, X. and Vittoria, C. (2005) Wave Propagation in Ferrite Involving Planar Anisotropy—Theory and Experiment. IEEE Transactions on Magnetics, 41, 2349-2354.
[13] Obol, M. and Vittoria, C. (2003) Microwave Permeability of Y-Type Hexaferrites in Zero Field. Journal of Applied Physics, 94, 4013-4017.
[14] Bai, Y., Zhou, J., Gui, Z., Yue, Z. and Li, L. (2003) Complex Y-Type Hexagonal Ferrites: An Ideal Material for HighFrequency Chip Magnetic Components. Journal of Magnetism and Magnetic Materials, 264, 44-49.
[15] Hansen, R.C. and Burke, M. (2000) Antennas with Magneto-Dielectrics. Microwave and Optical Technology Letters, 26, 75-78.
[16] Kong, L.B., Li, Z.W., Lin, G.Q. and Gan, Y.B. (2007) Ni-Zn Ferrite Composite with Almost Equal Values of Permeability and Permittivity for Low-Frequency Antenna Design. IEEE Transactions on Magnetics, 43, 6-10.
[17] Kim, I., Bae, S. and Kim, J. (2008) Effect of Ferrite Substrates on Antenna Miniaturization. Journal of Korean Physical Society, 52, 127-131.
[18] Bae, S., Hong, Y.K. and Lyle, A. (2008) Effect of Ni-Zn Ferrite on Bandwidth and Radiation Efficiency of Embedded Antenna for Mobile Phone. Journal of Applied Physics, 103, Article ID: 07E929.
[19] Liew, X.T., Chan, K.C. and Kong, L.B. (2009) Magnetodielectric Ni Ferrite Ceramics with Bi2O3 Additive for Potential Antenna Miniaturizations. Journal of Materials Research, 24, 324-332.
[20] Now submitting to Journal of Magnetism and Magnetic Materials.
[21] Bai, Y., Zhou, J., Gui, Z.L. and Li, L.T. (2004) Frequency Dispersion of Complex Permeability of Y-Type Hexagonal Ferrites. Materials Letters, 58, 1602-1606.
[22] Bai, Y., Zhou, J., Gui, Z.L. and Li, L.T. (2002) An Investigation of the Magnetic Properties of Co2Y Hexaferrite. Materials Letters, 57, 807-811.
[23] Nicolson, A.M. and Ross, G.F. (1970) Measurement of the Intrinsic Properties of Materials by Time Domain Techniques. IEEE Transactions on Instrumentation and Measurement, 19, 377-382.
[24] van der Zaag, P.J., van der Valk, P.J. and Rekveldt, M.Th. (1966) A Domain Size Effect in the Magnetic Hysteresis of NiZn-Ferrites. Applied Physics Letters, 69, 2927-2929.

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