Demodulation of servo tracking signals printed with a lithographically patterned master disk

Ishida, T.; Miyata, K.; Komura, Nobuyuki; Takaoka, T.

doi:10.1109/20.950857

Cited by 10 publications

(5 citation statements)

References 2 publications

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“…Experiments on the signal and pattern quality as a function of media coercivity up to 6 kOe [190] have also been reported. Ishida et al demodulated the signals from a head flying across the grooves and found the position error in a prototype drive was 30% of the track pitch, or 0.41 µm [191]. The printing technique has also been extended to perpendicular recording media having H c as high as 10 kOe using a soft Co film magnetic mask [192].…”

Section: Patterned Servomentioning

confidence: 99%

Nanofabricated and self-assembled magnetic structures as data storage media

Terris

Thomson

2005

J. Phys. D: Appl. Phys.

791

525

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Nanofabrication of magnetic storage media, where servo marks, discrete tracks or individual islands are defined, offer the prospect for improved performance and increased areal density. However, this increase in performance will require that new and additional processes be introduced into disk manufacturing. We review here the fundamental patterning and fabrication processes that have been proposed, along with their respective strengths and weaknesses and the potential advantages they may offer for magnetic recording. The increase in data density afforded by nanofabrication may have added significance as more conventional approaches to ever increasing density will encounter physical limitations set by the thermal stability of the recorded bits.

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Section: Patterned Servomentioning

confidence: 99%

Nanofabricated and self-assembled magnetic structures as data storage media

Terris

Thomson

2005

J. Phys. D: Appl. Phys.

791

525

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“…The step-type phase pattern is not ideal because the size of the erase band increases as the number of steps increases. If a contact magnetic pattern (Sugita et al 2000;Ishida et al 2001) can be utilized, the servo pattern should be an ideal phase pattern. If not, a three-step phase pattern is sufficient when the erase-band is narrow.…”

Section: Discussionmentioning

confidence: 99%

“…Hughes and Messner (2003) compared the position-signal quality obtained with these three patterns for the new servo pre-formatting process using patterning techniques such as magnetic printing (Sugita et al 2000;Ishida et al 2001). They said that the phase pattern was the best choice for preformatted media.…”

Section: Introductionmentioning

confidence: 99%

Optimizing servo-signal design for a hard-disk drives

2005

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To improve the non-repeatable runout (NRRO), repeatable runout (RRO), and nonlinearity of the position signal in hard-disk drives (HDDs), we established criteria for the off-track direction and for the bit direction. Position-signal nonlinearity and NRRO degradation are largely due to the interaction between track width, erase band size, and the sensitivity distribution of the head. So one criterion is for position-signal sensitivity. The other criterion is for burst-bit density, which causes RRO degradation. Using these criteria to compare, theoretically and experimentally, the effectiveness with which the quality of the position signal could be maintained using amplitude and phase patterns confirmed that the phase pattern is superior to the amplitude pattern.

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“…This autogeneration program can also be used to prepare CAD patterns for embedded servo media disks, 18 for which only the servo patterns are lithographically defined, while the data regions remain continuous.…”

Section: A Servo and Track Pattern Generationmentioning

confidence: 99%

Nanoimprint mold fabrication and duplication for embedded servo and discrete track recording media

Tan

Aung

Sbiaa

et al. 2009

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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Articles you may be interested inFabrication of wafer-scale nanopatterned sapphire substrate by hybrid nanoimprint lithography J. Vac. Sci. Technol. B 32, 06FG06 (2014); 10.1116/1.4898778 Design and fabrication of a metallic nanostamp using UV nanoimprinting and electroforming for replicating discrete track media with feature size of 35 nm J. Vac. Sci. Technol. B 31, 011801 (2013); 10.1116/1.4768685 Fabrication of 1 Teradot/in.2 CoCrPt bit patterned media and recording performance with a conventional read/write head J. Vac. Sci. Technol. B 30, 06FH01 (2012); 10.1116/1.4757955Fabrication of silicon template with smooth tapered sidewall for nanoimprint lithography Fabrication of a seamless roll mold by direct writing with an electron beam on a rotating cylindrical substrate A master mold for nanoimprint lithography was fabricated for discrete track recording ͑DTR͒ media using electron beam lithography and conventional etching techniques. The DTR pattern, containing 167 tracks of 120 nm pitch ͑60 nm land and groove widths͒ and embedded servo information, was automatically generated using an in-house developed program and was optimized for faster electron beam writing on an x-y stage. A daughter mold was duplicated from the master mold by nanoimprinting, using UV-curable resist and an intermediate polymer stamp technique. Scanning electron microscope images showed that the daughter mold was accurately and completely reproduced from the master mold.

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Demodulation of servo tracking signals printed with a lithographically patterned master disk

Cited by 10 publications

References 2 publications

Nanofabricated and self-assembled magnetic structures as data storage media

Nanofabricated and self-assembled magnetic structures as data storage media

Optimizing servo-signal design for a hard-disk drives

Nanoimprint mold fabrication and duplication for embedded servo and discrete track recording media

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