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Patterning of granular magnetic media with a focused ion beam to produce single-domain islands at >140 Gbit/in2

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3 Author(s)
Rettner, C.T. ; IBM Almaden Res. Center, San Jose, CA, USA ; Best, Margaret E. ; Terris, B.D.

We have used a focused ion beam to directly pattern thin-film granular perpendicular Co70Cr18Pt12 media. By cutting trenches ~6 nm deep in the ~20 nm media, we have produced square arrays of magnetically isolated islands with periods in the range 65-500 nm. At periods below ~130 nm we observe only single magnetic domains, which exhibit a rough “checker-board” pattern upon ac demagnetization. We have patterned at densities of over 140 Gbit/in2

Published in:

Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 4 )

Date of Publication:

Jul 2001

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