Perpendicular Magnetic Recording
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.
KeywordsPermeability Anisotropy Ferrite Dium Folk
Unable to display preview. Download preview PDF.
- 4.Nakamura, Y., (1991) Theoretical and experimental properties of perpendicular magnetic recording, Jour, of Magn. Soc. Jpn, 15, Supplement S2, 497–506.Google Scholar
- 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
- 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
- 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
- 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.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
- 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.Nakamura, Y., (1991) Theoretical and experimental properties of perpendicular magnetic recording, Jour, of Magn. Soc. Jpn., 15, Supplement S2, 497–506.Google Scholar
- 28.lwasaki, S., Nakamura, Y, and Muraoka., H., (1981) Wavelength response of perpendicular magnetic recording, IEEE Trans. Magn., MAG-17, 2435–2537.Google Scholar
- 30.Nakamura, Y, (1994) Challenge to terabit perpendicular spinic storage, Jour. Magn. Soc. of Jpn, 18, Supplement SI, 161–170.Google Scholar
- 32.Wood, R., (2000) The feasibility of magnetic recording at 1 Terabit per square inch, IEEE Trans., 36, 36–42.Google Scholar