Perpendicular Magnetic Recording

  • Yoshihisa Nakamura
Part of the NATO Science Series book series (NAII, volume 41)


Perpendicular magnetic recording (PMR) has the fundamental potential of extremely high bit density recording. Although many efforts have been made for the practical use of PMR, the recording apparatus has still not been manufactured commercially. One of many problems hesitated to make PMR practicable is that a reasonable way has still not become clear to practical use. Moreover there were a lot of unsolved problems peculiar to PMR, such as media noise, head-induced erasure and so on. Lately, the solutions to these technical issues were clarified for the practical use of a perpendicular magnetic hard disk drive. Furthermore, we have attained an error rate of less than 10-p7 at 310kFCI with a newly developed flying type thin-film single-pole head in 1998, and Hitachi group has been presented practical capability of HDD with PMR over 50Gbit/inchp2 in INTERMAG 2000. In this paper, first, the reason why PMR is useful for high bit density writing will be described from the theoretical and the historical background. Then, how should make PMR, what characteristics are obtained, and what ability and possibility over 1OOGbit/inchp2 exist, the analysis, the results and the future, will be discussed.


Coercive Force Magnetic Recording Magnetization Distribution Major Curve Head Field 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. 1.
    Iwasaki, S. and Nakamura, Y. (1977) An analysis for the magnetization mode for high density magnetic recording, IEEE Trans. Magn., MAG-13, 1272–1277.CrossRefGoogle Scholar
  2. 2.
    Cain, W., Payne, A., Baldwinson, M. and Hempstead, R., (1996) Challenges in practical implementation of perpendicular magnetic recording, IEEE Trans. Magn., 32, 97–102.CrossRefGoogle Scholar
  3. 3.
    Yamamoto, S., Nakamura, Y. and Iwasaki, S., (1987) Extremely high bit density recording with single-pole perpendicular head, IEEE Trans. Magn., MAG-23, 2070–2072.CrossRefGoogle Scholar
  4. 4.
    Nakamura, Y., (1991) Theoretical and experimental properties of perpendicular magnetic recording, Jour, of Magn. Soc. Jpn, 15, Supplement S2, 497–506.Google Scholar
  5. 5.
    Muraoka, M., Sato, K., Sugita, Y. and Nakamura, Y., (1999) Low inductance and high efficiency single-pole writing head for perpendicular double layer recording media, IEEE Trans. Magn., 33, 643–648.CrossRefGoogle Scholar
  6. 6.
    Takano, H., Nishida, Y., Futamoto, M., Aoi, H. and Nakamura, Y., (2000) PossibiIities of 40Gb/inp2 perpendicular recording, Digest of 1NTERMAG 2000, AD-06.Google Scholar
  7. 7.
    Nakamura, Y., (1999) Perpendicular magnetic recording-progress and prospects, Jour. of Magn. Magn. Mater, 200, 634–648.CrossRefGoogle Scholar
  8. 8.
    Iwasaki, S. and Nakamura, Y., (1964) A study of magnetizing process in short wave length recording, Jour, of Fnst. TV Engineers of Jpn., 18, 638–646, (in Japanese).Google Scholar
  9. 9.
    Nakamura, Y., Tagawa, I. and Iwasaki, S., (1987) Analysis of magnetization distribution in double-layered perpendicular magnetic recording medium, IEEE Trans. Magn., MAG-23, 2856–2858.CrossRefGoogle Scholar
  10. 10.
    Tagawa, I. and Nakamura, Y.. (1994) Magnetic recording simulation and its applications, Jour, of Magn. Magn. Mater, 134, 382–389.CrossRefGoogle Scholar
  11. 11.
    Nakamura, Y., (1995) Extremely high-density magnetic information storage-Outlook based on analyses of magnetic recording mechanisms-, IEICE Trans. Electron., E78-C, 1477–1492.Google Scholar
  12. 12.
    Iwasaki, S. and Nakamura, Y., (1978) The magnetic field distribution of a perpendicular recording head, IEEE Trans. Magn., MAG-14, 436–438.CrossRefGoogle Scholar
  13. 13.
    Iwasaki, S., Nakamura Y., and Ouchi K., (1979) Perpendicular magnetic recording with a composite anisotropy film, I EEE Trans. Magn., MAG-15, 1456–1458.CrossRefGoogle Scholar
  14. 14.
    Nakamura, Y. and Yamamoto, S. and Iwasaki, S., (1986) The effect of magnetic interaction between medium and head on perpendicular magnetic recording characteristics, IEEE Trans. Magn., MAG-22, 376–378.CrossRefGoogle Scholar
  15. 15.
    Nakamura, Y. and Iwasaki, S., (1982) Reproducing characteristics of perpendicular magnetic head, IEEE Trans. Magn., MAG-18, 1167–1169.CrossRefGoogle Scholar
  16. 16.
    Muraoka, H., Sato, K. and Nakamura, Y., (1998) Extremely low inductance thin-film single-pole head on flying slider, IEEE Trans. Magn., 34, 1474–1476.CrossRefGoogle Scholar
  17. 17.
    Onodera, S., Okijima, S., Ouchi, K., Nakamura, Y. and Iwasaki, S., (1991) Co-Cr perpendicular hard disk media with thin Fe-Co backlayer for ring-type head, Jour, of Magn. Soc. Jpn., 15, Supplement S2, 287–292.Google Scholar
  18. 18.
    Ando, T., Mizukami, M. and Nishihara, T., (1995) Effects of in-plane hard magnetic layer on demagnetization and media noise in triple-layered perpendicular recording media, IEICE Trans. Elec, E78-C, 1543–1549.Google Scholar
  19. 19.
    Muraoka, H., Yamada, H. and Nakamura, Y., (1996) MR head reading characteristics in perpendicular magentic recording, IEEE Trans. Magn., 32, 3482–3484.CrossRefGoogle Scholar
  20. 20.
    Ho, K., Kane, M. H., Lairson, B. M., Noynes, G. I., Harig, J. C. and Kim, Y. K., (1997) Data storage and retrieval using perpendicular media and magneto-resistive read transducer, IEEE Trans. Magn., 33, 2538–2542.CrossRefGoogle Scholar
  21. 21.
    Honda, N., Ariake, J., Ouchi, K. and Iwasaki, S., (1998) Low noise Co-Cr-Nb perpendicular recording media with high squareness, IEEE Trans. Magn., 34, 1651–1653.CrossRefGoogle Scholar
  22. 22.
    Miura, K., Muraoka, H., Sugita, Y., Nakamura, Y., (2000) Noise characterization for perpendicular double layer media by Voronoi cell model, IEEE Trans, Magn., 36, (to be published).Google Scholar
  23. 23.
    Nakamura, Y., (1991) Theoretical and experimental properties of perpendicular magnetic recording, Jour, of Magn. Soc. Jpn., 15, Supplement S2, 497–506.Google Scholar
  24. 24.
    Tagawa, I., and Nakamura, Y., (1993) Particle coercivity distribution of magnetic recording medium, Jour, of Magn. Magn. Mater, 120, 136–140.CrossRefGoogle Scholar
  25. 25.
    Jiles, D. C, and Atherton, D. L., (1986) Theory of ferromagnetic hysteresis, Jour. of Magn. Magn. Mater, 61, 48–60.CrossRefGoogle Scholar
  26. 26.
    Tagawa, I., Takeo, A. and Nakamura, Y, (1996) Numerical analysis of noise and interparticle interaction in perpendicular magnetic recording media, Jour, of Magn. Magn., Mater, 166, 341–344.CrossRefGoogle Scholar
  27. 27.
    Muraoka, H., Sugita, Y, and Nakamura, Y., (1999) Simplified expression of shielded MR head response for double-layer perpendicular medium, IEEE Trans. Magn., 35, 2235–2237.CrossRefGoogle Scholar
  28. 28.
    lwasaki, S., Nakamura, Y, and Muraoka., H., (1981) Wavelength response of perpendicular magnetic recording, IEEE Trans. Magn., MAG-17, 2435–2537.Google Scholar
  29. 29.
    Potter, R. I., (1974) Digital magnetic recording, IEEE Trans. Magn., MAG-10, 502–508.CrossRefGoogle Scholar
  30. 30.
    Nakamura, Y, (1994) Challenge to terabit perpendicular spinic storage, Jour. Magn. Soc. of Jpn, 18, Supplement SI, 161–170.Google Scholar
  31. 31.
    Chou, S. Y, Wei, M. S., Krauss, P. R., and Fischer, P. B., (1994) Single-domain magnetic poltar array of 35nm diameter and 65 Gbits/in.p2 density for ultrahigh density quantum magnetic storage, J. Appl. Phys. 76, 6673–6675.CrossRefGoogle Scholar
  32. 32.
    Wood, R., (2000) The feasibility of magnetic recording at 1 Terabit per square inch, IEEE Trans., 36, 36–42.Google Scholar
  33. 33.
    Sun, S., Murray, C. B., Weiler, D., Folks, L., and Moser, A., (2000) Monodisperse FePt Monoparticles and ferromagnetic FePt nanocrystal superlattices, SCIENCE, 287, 1989–1992.CrossRefGoogle Scholar
  34. 34.
    Muraoka, H., and Nakamura, Y, (1994) Multi-track submicron-width recording with a novel integrated single pole head in perpendicular magnetic recording, IEEE Trans. Magn., 30, 3900–3902.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2001

Authors and Affiliations

  • Yoshihisa Nakamura
    • 1
  1. 1.Research Institute of Electrical CommunicationTohoku UniversitySendaiJapan

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