Noise from underlayer of perpendicular magnetic recording medium

Y. Uesaka, M. Koizumi, N. Tsumita, O. Kitakami, H. Fujiwara

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Noise from the underlayer is observed with a Mn-Zn ferrite head and a Co-Mo-Zr low coercivity amorphous underlayer. Three kinds of noise are observed, spike noise (s), medium noise (m), and low noise (l). s noise is generated through the domain walls of an underlayer. m noise originates from the interaction between an underlayer and the reproducing head's residual magnetization. Three effective methods are tested for reducing the noise: (1) increase of coercivity of an underlayer, (2) use of an ac-erased head, and (3) use of a thin-film head.

Original languageEnglish
Pages (from-to)3925-3927
Number of pages3
JournalJournal of Applied Physics
Issue number8
Publication statusPublished - 1985
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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