Fabrication of patterned media for high density magnetic storage

1999 ◽  
Vol 17 (6) ◽  
pp. 3168 ◽  
Author(s):  
C. A. Ross ◽  
Henry I. Smith ◽  
T. Savas ◽  
M. Schattenburg ◽  
M. Farhoud ◽  
...  
Keyword(s):  
High Density ◽  
Magnetic Storage ◽  
Patterned Media

Fabrication of patterned media for high density magnetic storage

2000 ◽  
Vol 53 (1-4) ◽  
pp. 67-67 ◽  
Author(s):  
C ROSS ◽  
H SMITH ◽  
T SAVAS ◽  
M SCHATTENBURG ◽  
M FARHOUD ◽  
...  
Keyword(s):  
High Density ◽  
Magnetic Storage ◽  
Patterned Media

Role of Dipolar Interactions on the Thermal Stability of High-Density Bit-Patterned Media

2012 ◽  
Vol 3 ◽  
pp. 4500204-4500204 ◽  
Author(s):  
N. Eibagi ◽  
J. J. Kan ◽  
F. E. Spada ◽  
E. E. Fullerton
Keyword(s):  
Thermal Stability ◽  
High Density ◽  
Dipolar Interactions ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Thermal Stability Of

Fabrication of ridge-and-groove servo pattern consisting of self-assembled dots for high-density bit patterned media

2010 ◽  
Author(s):  
Yoshiyuki Kamata ◽  
Akira Kikitsu ◽  
Naoko Kihara ◽  
Seiji Morita ◽  
Kaori Kimura ◽  
...  
Keyword(s):  
High Density ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Self Assembled

A Magnetic Rotary Encoder for Patterned Media Lithography

2014 ◽  
Author(s):  
Shaomin Xiong ◽  
Yuan Wang ◽  
Xiang Zhang ◽  
David Bogy
Keyword(s):  
High Speed ◽  
New Technology ◽  
Hard Disk Drives ◽  
Magnetic Storage ◽  
Magnetic Islands ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Rotary Encoder ◽  
Digital Format ◽  
Field Programmable

Bit patterned media (BPM) is expected to enable the magnetic storage density in hard disk drives (HDDs) beyond 1 Tb/in2. BPM uses isolated magnetic islands to record the data information. However, the large volume fabrication of those patterned media disks at an affordable cost is a challenge for this new technology. A master template is the first step for patterned media fabrication. Using nano-imprint technology, the master template can be replicated to tens of thousands of pattern disks. A rotary electron beam lithography machine or plasmonic nanolithography machine is recommended to assist in the fabrication of the master template. In both systems, a high resolution encoder system for positioning in the rotary lithography machine is necessary. In this paper, a magnetic rotary encoder system is introduced. The encoder system can be operated at several thousand revolution per minute (RPM). The scale pitch is 90 nm which is one to two orders smaller than current optical encoders. The resolution is about 2.8 million counts per revolution (CPR). A flying magnetic head is used to retrieve the readback signal from the magnetic encoders. A field programmable gate array (FPGA) is implemented to finish the high speed signal processing and provide a digital format encoder signal to trigger the lithography machine at a rate of several Mega Hertz.

Investigation of Graph-Based Detection in Iterative Decoding for Bit-Patterned Media Recording

2014 ◽  
Vol 979 ◽  
pp. 58-61
Author(s):  
Piya Kovintavewat
Keyword(s):  
Iterative Decoding ◽  
Intersymbol Interference ◽  
High Density ◽  
Soft Information ◽  
Experimental Results ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Recording Density ◽  
Moderate Complexity ◽  
Intertrack Interference

High-density bit-patterned media recording (BPMR) can be obtained by reducing the spacing between data bitislands in both the along-and across-track directions, thus leading to severe intersymbol interference (ISI) and intertrack interference (ITI) because of small bit and track pitches, respectively. Here, we propose to use the graph-based detector, instead of the trellis-based detector, in iterative decoding to combat the ISI and the ITI for a multi-head multi-track BPMR system. Specifically, the readback signal is sent to the graph-based detector before iteratively exchanging the soft information with a decoder. Experimental results indicate that at low to moderate complexity, the proposed scheme outperforms the existing schemes, especially at high recording density.

Fabrication of 6-nm-Sized Nanodot Arrays with 12 nm-Pitch along Guide Lines Using both Self-Assembling and Electron Beam-Drawing for 5 Tbit/in2 Magnetic Recording

2013 ◽  
Vol 596 ◽  
pp. 73-77
Author(s):  
Sumio Hosaka ◽  
Takashi Akahane ◽  
Miftakhul Huda Huda ◽  
Takuya Komori ◽  
Hui Zhang ◽  
...  
Keyword(s):  
Electron Beam ◽  
Magnetic Recording ◽  
Self Assembly ◽  
Magnetic Storage ◽  
Fusion Method ◽  
Patterned Media ◽  
Dimethyl Siloxane ◽  
Self Assembling ◽  
Nanodot Arrays ◽  
Guide Lines

A possibility to fabricate nanodot arrays with a dot size of <10 nm="" and="" a="" dot="" pitch="" of="" 12="" along="" guide="" lines="" has="" been="" studied="" for="" ultrahigh-density="" patterned="" media="" in="" magnetic="" recording="" this="" was="" by="" using="" self-assembling="" block="" copolymers="" polystyrene-poly="" dimethyl="" siloxane="" ps-pdms="" electron="" beam="" eb="" drawing="" with="" hydrogen="" silsesquioxane="" hsq="" negative="" resist="" their="" fusion="" method="" it="" demonstrated="" that="" the="" could="" possibly="" achieve="" 6-nm-sized="" nanodot="" arrays="" 10="" 4="" x="" sup="">2 using self-assembling with PS-PDMS of molecular weight 7000-1500 and EB-drawing for narrow guide lines. These results prove that the fusion method is required for achieving extremely small dot arrays as 5 Tbit/in2magnetic storage devices.Keywords: Nanodot, self-assembly, electron-beam drawing, graphoepitaxy, patterned media, magnetic recording.

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