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ENREGISTREMENT MAGNETIQUE ULTRA-HAUTE DENSITE SUR MEDIAS DISCRETS A AIMANTATION PERPENDICULAIRE

Abstract : Patterned media is a potential new recording disk technology which can be used to increase the areal density in magnetic storage devices towards 1 Tbit/in2 and beyond. Patterned media allows circumventing the super-paramagnetic limit, which is expected to appear in conventional magnetic recording media at densities of the order of 300 Gb/in². Implementation of patterned media requires the fabrication of sub-50nm features over large areas at high-throughput manufacturing and low cost. In our approach, called pre-patterned media, isolated tracks of sub-100nm islands have been fabricated using nano-imprint technology, followed by sputtering deposition of a Co/Pt multilayer exhibiting a perpendicular-to-plane anisotropy. The recording performances on the pre-patterned magnetic structures have been studied with a contact tester using a high-resolution (~1nm) piezoelectric positioning stage and commercial giant magnetoresistive write/read heads. Bits with different lengths (BL), i.e. including a varying number of dots, have been written on the pattern. The synchronization requirements have been investigated along tracks of dots revealing a significant ‘‘write window,'' where islands can be written correctly, of about half the dot period. Moreover, the signal to noise ratio (SNR) has been calculated, by evaluating the correlation coefficients of the readback voltages of periodically written pseudo random bit sequences (PRBS). We conclude that the major sources of medium noise are the bit size fluctuations, bit amplitude and the jitter noise due to the substrate replication processes.
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Contributor : Mohamed Asbahi <>
Submitted on : Monday, August 24, 2009 - 12:05:30 PM
Last modification on : Wednesday, November 4, 2020 - 1:56:03 PM
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Mohamed Asbahi. ENREGISTREMENT MAGNETIQUE ULTRA-HAUTE DENSITE SUR MEDIAS DISCRETS A AIMANTATION PERPENDICULAIRE. Matière Condensée [cond-mat]. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00410755⟩

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