Tribological Challenges of Flying Recording Heads Over Unplanarized Patterned Media

Mate, C. Mathew; Ruiz, Oscar; Wang, Run-Han; Feliss, Bert; Bian, X.; Wang, Shi-Ling

doi:10.1109/tmag.2012.2205226

Cited by 2 publications

(2 citation statements)

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“…This more gradual rise occurs due to the smaller area of contact caused by the rougher patterned media surface, which generates a lower friction force and less friction induced bounce that would picked up by the AE sensor. Similar behavior has been previously reported by our lab for discretetrack media (DTM) [105].…”

Section: ) Contact Detection On Bpmsupporting

confidence: 89%

“…Since the design of the appropriate air bearing surface on the recording head that results in the proper flying height is typically done using air bearing simulations, many groups have examined how having patterned disk topography influences the flying height performance [100], [105]- [109]. Fortunately, the consensus is that the presence of a patterned topography adds only a small and predictable correction to air bearing codes for heads flying over ideally smooth surfaces.…”

Section: ) Flying Height and Modulation Of Hmsmentioning

confidence: 99%

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Bit-Patterned Magnetic Recording: Theory, Media Fabrication, and Recording Performance

et al. 2015

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Bit Patterned Media (BPM) for magnetic recording provides a route to thermally stable data recording at >1 Tb/in 2 and circumvents many of the challenges associated with extending conventional granular media technology. Instead of recording a bit on an ensemble of random grains, BPM is comprised of a well ordered array of lithographically patterned isolated magnetic islands, each of which stores one bit. Fabrication of BPM is viewed as the greatest challenge for its commercialization. In this article we describe a BPM fabrication method which combines rotary-stage e-beam lithography, directed self-assembly of block copolymers, self-aligned double patterning, nanoimprint lithography, and ion milling to generate BPM based on CoCrPt alloy materials at densities up to 1.6 Td/in 2 (teradot/inch 2 ). This combination of novel fabrication technologies achieves feature sizes of <10 nm, which is significantly smaller than what conventional nanofabrication methods used in semiconductor manufacturing can achieve. In contrast to earlier work which used hexagonal closepacked arrays of round islands, our latest approach creates BPM with rectangular bitcells, which are advantageous for integration of BPM with existing hard disk drive technology. The advantages of rectangular bits are analyzed from a theoretical and modeling point of view, and system integration requirements such as provision of servo patterns, implementation of write synchronization, and providing for a stable head-disk interface are addressed in the context of experimental results. Optimization of magnetic alloy materials for thermal stability, writeability, and tight switching field distribution is discussed, and a new method for growing BPM islands from a specially patterned underlayer -referred to as "templated growth" -is presented. New recording results at 1.6 Td/in 2 (roughly equivalent to 1.3 Tb/in 2 ) demonstrate a raw error rate <10 -2 , which is consistent with the recording system requirements of modern hard drives. Extendibility of BPM to higher densities, and its eventual combination with energy assisted recording are explored.Index Terms-Bit patterned media, hard disk drive, block copolymer, self-assembly, double patterning, e-beam lithography, sequential infiltration synthesis, nanoimprint lithography, templated growth, thermal annealing, Co alloys, magnetic multilayers, interface anisotropy, magnetic recording, write synchronization, prepatterned servo, areal density.

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Section: ) Contact Detection On Bpmsupporting

confidence: 89%