Magnetic grain size reduction by using oxygen exposure process onto very thin islandlike WCr seedlayer in longitudinal recording media

S. Yoshimura, D. D. Djayaprawira, M. Takahashi, M. Mikami, K. Komiyama, A. Horii, A. Ohno, S. Katayama

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

To reduce the grain size and the media noise in CoCrPtB/CrMo longitudinal media, a sputtering process which includes the exposure of oxygen onto the surface of a very thin (0.5 nm) WCr 50 seedlayer has been developed. The purpose of oxygen exposure onto the seedlayer surface is to enhance the nucleation sites of the seedlayer. It is found that (a) the exposure of 25 and 100 L (1 L corresponds to the adsorption of one layer of the oxygen atom when the sample is exposed to oxygen atmosphere) of oxygen onto the seedlayer reduces the mean grain diameter of the magnetic film from 8.3 to 7.5 and to 7.0 nm, respectively, (b) the exposure of 25 and 100 L of oxygen onto the seedlayer decreases the media noise by 15% and 45% and improves the media signal to noise ratio by 1.5 and 5 dB, respectively.

Original languageEnglish
Pages (from-to)8629-8631
Number of pages3
JournalJournal of Applied Physics
Volume91
Issue number10 I
DOIs
Publication statusPublished - 2002 May 15
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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