Advertisement

High-Frequency Magnetics

  • Makoto SoneharaEmail author
Chapter
Part of the Engineering Materials book series (ENG.MAT.)

Abstract

When the magnetic material is used as the high-frequency devices such as RF inductor, the domain walls do not move; so, a soft magnetic material with an uniaxial magnetic anisotropy is often used in the case. A magnetic field is applied in the direction of the hard axis, and magnetization rotation is used in the soft magnetic material. In the soft magnetic material, not only the higher real part and the lower imaginary part of the complex permeability but also the electrical resistivity should be high. For example, when it is used for the magnetic core of an inductor, eddy current loss increases when the electric resistivity of the material is low. In addition, we also need various resources such as reducing the eddy current loss by putting a slit in the magnetic material in order to apply it in RF devices.

Keywords

RF inductor Uniaxial magnetic anisotropy Magnetic thin film Power inductor Magnetic composite material Eddy current loss 

References

  1. 1.
  2. 2.
    Maruyama, T., et al.: Experimental study of cross-talk suppression effect by introducing magnetic thin film to spiral inductor for CSP RF-IC. The paper of Technical Meeting on Magnetics, IEE Japan, MAG-10-201, pp. 11–16 (2010)Google Scholar
  3. 3.
    Hidayov, O.A., et al.: 0.7–2.7 GHz wideband CMOS low-noise amplifier for LTE application. Electron. Lett. 49(23), 1433–1435 (2013)CrossRefGoogle Scholar
  4. 4.
    Gardner, D.S., et al.: Review of on-chip inductor structures with magnetic films. IEEE Trans. Magn. 45(10), 4760–4766 (2009)CrossRefGoogle Scholar
  5. 5.
    Ohta, K.: Foundation of magnetic engineering II, Kyoritsu Zensho (1990)Google Scholar
  6. 6.
    Munakata, M., et al.: Magnetic properties and frequency characteristics of (CoFeB)x–(SiO1.9)1−x and CoFeB films for RF application. Trans. Magn. Soc. Japan 2(5), 388–393 (2002)CrossRefGoogle Scholar
  7. 7.
    Ikeda, S., et al.: A design chart of effective permeability of magnetic film with parallel slit structure. Technical Report of IEE of Japan, MAG-02-111, pp. 25–29 (2002)Google Scholar
  8. 8.
    Tsai, C.S., et al.: Wideband electronically tunable microwave bandstop filters using iron film-gallium arsenide waveguide structure. IEEE Trans. Magn. 35, 3178–3180 (1999)CrossRefGoogle Scholar
  9. 9.
    Sonehara, M., et al.: Preparation and characterization of Mn-Ir/Fe-Si exchange-coupled film for high-frequency micromagnetic devices. J. Magn. Soc. Japan 29(2), 132–137 (2005)CrossRefGoogle Scholar
  10. 10.
    Kondo, K., et al.: FMR study of plated Ni-Zn-Co ferrite films. In: 28th Digest of Annual Conference on Magnetics in Japan, vol. 28, p. 479 (2004)Google Scholar
  11. 11.
    Ishida, H., et al.: Fabrication of Ni-Zn ferrite thin film using the low-target-voltage reactive ECR sputtering. method. In: 28th Digest of Annual Conference on Magnetics in Japan, vol. 28, p. 480 (2004)Google Scholar
  12. 12.
    Yanai, T., et al.: High temperature magnetic properties of Fe-based toroidal core with controlled permeability. In: 30th Digest of Annual Conference on Magnetics in Japan, vol. 30, p. 291 (2006)Google Scholar
  13. 13.
    Itoh, T., et al.: Nano-structure and magnetic properties of Ni-Fe granular thin films produced by evaporation. In: 28th Digest of Annual Conference on Magnetics in Japan, vol. 28, p. 482 (2004)Google Scholar
  14. 14.
    Ohnuma, S., et al.: Nano-granular magnetic thin films for applications as soft magnetic materials. In: Digests of the 30th Annual Conference on Magnetics, vol. 30, pp. 435–436 (2006)Google Scholar
  15. 15.
    Naoe, M., et al.: Investigation of controlling in-plane uniaxial anisotropy of CoPd-CaF2 nanogranular films by tandem-sputtering deposition. IEEE Magn. Lett. 5(1), 1–4 (2014)Google Scholar
  16. 16.
    Ikeda, K., et al.: IEEE INTERMAG Conference 2009, BS-07 (2009)Google Scholar
  17. 17.
    Sonehara, M., et al.: Fundamental study of high Q-factor RF spiral inductor using carbonyl-iron/epoxy composite magnetic core. IEEJ Trans. Electr. Electron. Eng. 11(S1), S3–S8 (2016)CrossRefGoogle Scholar
  18. 18.
    Ikeda, K., et al.: Technical meeting on magnetics. IEE Japan, MAG-09-80 (2009)Google Scholar
  19. 19.
    Sugawa, Y., et al.: Carbonyl-iron/epoxy composite magnetic core for planar power inductor used in package-level power grid. IEEE Trans. Magn. 49(7), 4172–4175 (2013)CrossRefGoogle Scholar
  20. 20.
  21. 21.
    Sugimura, K., et al.: Formation of high electrical-resistivity thin surface layer on carbonyl-iron powder (CIP) and thermal stability of nanocrystalline structure and vortex magnetic structure of CIP. AIP Adv. 6(5), #055932 (2016)Google Scholar
  22. 22.
    Sato, K., et al.: Fabrication of metal composite magnetic core transformer with surface-oxidized carbonyl-iron powder and its application to the flyback-type dc-dc converter. Trans. Magn. Soc. Japan (Special Issues) 1, 44–52 (2017)Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Shinshu UniversityNaganoJapan

Personalised recommendations