Magnetic characterization and recording properties of patterned Co sub(70)Cr sub(18)Pt sub(12 ) perpendicular media

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 Co sub(70)Cr sub...

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Bibliographic Details
Published inIEEE transactions on magnetics Vol. 38; no. 4; pp. 1725 - 1730
Main Authors Rettner, C T, Anders, S, Thomson, T, Albrecht, M, Ikeda, Y, Best, ME, Terris, B D
Format Journal Article
LanguageEnglish
Published 01.07.2002
Subjects
Coercive force
Density
Islands
Jitter
Magnetic storage
Media
Recording
Thermal instability
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Summary: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 Co sub(70)Cr sub(18)Pt sub( 12) 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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ISSN:0018-9464
DOI:10.1109/TMAG.2002.1017763