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Low noise properties and thermal stability of Co-based thin film media for high density longitudinal recording

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6 Author(s)
Abarra, E.N. ; File Memory Lab., Fujitsu Labs. Ltd., Atsugi, Japan ; Okamoto, I. ; Sato, K. ; Yoshida, Y.
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Media with excellent signal to noise properties and adequate high temperature thermal stability have been developed for over 20 Gbit/in2 recording. The media are fabricated by dc magnetron sputtering onto textured NiP films on Al-Mg substrates. The magnetic layer is a CoCr-based quaternary alloy with (11.0) preferred orientation on a Cr alloy [002] underlayer. The average grain diameter has been reduced to an average of <10 nm. TEM-EDX studies revealed that Cr segregation has been enhanced compared to a previous CoCrPtTa media used for 15 Gbit/in2 recording resulting in improved Co to Cr core composition and increased grain boundary Cr content. Spinstand measurements of the thermal decay after annealing at 65°C indicate sufficient thermal stability at 400 kfci for media with Mrδ>0.3 memu/cm2 consistent with magnetometry measurements.

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Magnetics, IEEE Transactions on  (Volume:36 ,  Issue: 1 )