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Magnetic characterization and recording properties of patterned Co 70Cr18Pt12 perpendicular media

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7 Author(s)
Rettner, C.T. ; IBM Almaden Res. Center, San Jose, CA, USA ; Anders, Simone ; Thomson, T. ; Albrecht, M.
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A lithographically patterned magnetic medium is one of the proposed routes to magnetic recording at a density beyond that thought to be possible using conventional recording media due to thermal instability caused by superparamagnetism. Using a focused ion beam to pattern a granular Co70Cr18Pt12 film, we have fabricated sub-80-nm size islands that are single domain and with a narrowed switching field distribution and an enhanced thermal stability. Magnetic isolation of the islands is shown to be a result of vanishing of magnetic remanence and coercivity in the irradiated region and not a result of sputtering. Recording measurements using a quasi-static giant magnetoresistive head demonstrate the sensitivity to detect single 80-nm islands. The readback jitter from the patterned region is dramatically reduced compared to that measured for continuous media at the same linear density

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Magnetics, IEEE Transactions on  (Volume:38 ,  Issue: 4 )