DOI QR코드

DOI QR Code

A Study on Physical Properties Of Co3O4-added Ni- Zn Ferrite at High Frequency

Co3O4첨가에 따른 고주파용 Ni-Zn계 ferrite의 물리적 특성 연구

  • Published : 2002.10.01

Abstract

We studied the physical properties of $Co_3$$O_4$-added Ni-Zn ferrite which were sintered at 1050~110$0^{\circ}C$ for 2 hours. X-ray diffraction showed a spinel structure, and optical microscopy showed grain sizes of 5 to 10 $\mu\textrm{m}$. As the sintering temperature was increased from $1050^{\circ}C$ to $1070^{\circ}C$, the initial permeability and magnetic induction increased, and both of the loss factor and the coercive force decreased. The Curie temperatures were about $^234~245{\circ}C$ with added $Co_3$$O_4$. The initial permeability was 350 to 420 and maximum magnetic induction density and coercive force 4870G to 4980G and 0.15 Oe to 0.21 Oe, respectively which were similar to those of Ni-Zn ferrite synthesized in the conventional process. The frequency of specimen was in the range of 1MHz to 300MHz. In the plot of initial permeability vs. frequencies, a $180^{\circ}C$ rotation of the magnetic domain could be perceived in a broad band of microwave before and after the resonance frequency.

References

  1. C.S. Lee, C.Y. Lee and D.W. Kwon, J. of Magnetics, 7(2) 25 (2002) https://doi.org/10.4283/JMAG.2002.7.2.025
  2. C.W. Kim and J.G. Koh, J. of Magnetics, 7(2) 29 (2002) https://doi.org/10.4283/JMAG.2002.7.2.029
  3. A. One, T. Maruno and N. Kaihara, Ferrites Proceedings ICF-6, 1206 (1992)
  4. W.R. Buessen, Cer. Bull. 63, 582 (1984)
  5. E. Hirota and T. Mihara, J. Appl. Phys. 5(7), 563 (1966) https://doi.org/10.1143/JJAP.5.563
  6. Y. Shicihjo, N. Tsuya and K. Suzuki, J. Appl. Phys. Suppl. 32, 386s (1961)
  7. J.G. Koh, Ungyong Mulli, 12(5) 484 (1999)
  8. J.G. Koh and J.M. Song, Basics and Applications of Magnetic Physics, Soongsil Univ. Press, Seoul, (2001), pp. 153
  9. A. Morell, Am. Cer. Soc. Bull. 50, 6 (1980)
  10. J.G. Koh, Applications of Magnetic Physics, Soongsil Univ. Press, Seoul, (1992), pp. 83
  11. ANST/ASTM E-112-77 (1977)
  12. J.G. Koh and K.U. Kim, New Phys. 26(6) 540 (1986)
  13. J.W. Cho, S.B. Jin, W.H. Moon and Y.S. Sin, Electrical & Electronic Mat. Eng. 8(6), 748 (1995)
  14. S. Chikazumi, Physics of Feromagnetism, Clarendom Press. Oxford (1997) pp. 556-562
  15. J.M. Song and J.G. Koh, New Physics, 34(1), 115 (1994)
  16. J.M. Song and J.G. Koh, New Physics, 34(6), 743 (1994)
  17. J.G. Koh and J.M. Song, Basics and Applications of Magnetic Physics, Soongsil Univ. Press, Seoul, (2001), pp. 186