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About 1,639 papers for “Patterned media”

Patterned Media

2012

This chapter contains sections titled: Introduction Fabrication of a Metallic Nano Mold Using a UV-Imprinted Polymeric Master Fabrication of Patterned Media Using the Nano Replication Process Fabrication of Patterned Media Using Injection Molding Measurement and Analysis of Magnetic Domains of Patterned Media by Magnetic Force Microscopy Conclusions References

Cited by 0

Patterned Magnetic Recording Media

CA Ross · Annual Review of Materials Research · 2001

▪ Abstract Continuing increases in the areal density of hard disk drives will be limited by thermal instability of the thin film medium. Patterned media, in which data are stored in an array of single-domain magnetic particles, have been suggested as a means to overcome this limitation and to enable recording densities of up to 150 Gbit cm −2 (1 Tbit inch −2 ) to be achieved. However, the implementation of patterned media requires fabrication of sub-50-nm features over large areas and the design of recording systems that differ substantially from those used in conventional hard drives. This review describes patterned media, including the fabrication of arrays of small magnetic particles and their magnetic properties, such as domain structure, reversal mechanisms, thermal stability, and interactions. The practical implementation of patterned media recording schemes is assessed.

Cited by 754

for Patterned Media By

Caroline Ross, Samuel M. Allen, Anay Chaube · 2008

As device size decreases, conventional lithographic methods are finding it increasingly hard to keep up. Introduction of newer method such as E-beam, X-ray lithography etc. has demonstrated possibility of scaling to lower dimensions. However most of these methods are too expensive, too complex or too slow. Hence a method is required which can provide high resolutions at low cost, is easy to implement and can be integrated with current processing technologies. Block copolymer self assembly promises to do just that. An immiscible block copolymer will microphase separate into individual domains due to unfavorable

Cited by 0

Defect analysis for patterned media

Zhengmao Ye, J. Fretwell, Kang Luo et al. · Journal of Vacuum Science & Technology B Nanotechnology and Microelectronics Materials Processing Measurement and Phenomena · 2010

Imprint lithography has been shown to be an effective technique for the replication of nanoscale features. Acceptance of imprint lithography for manufacturing will require a demonstration of defect levels commensurate with cost-effective device production. This article summarizes the results of defect inspections of hard disks patterned using jet and flash imprint lithography (J-FIL™). This work presents a methodology for automated pattern inspection and defect classification for imprint-patterned media. Candela CS20 and 6120 tools from KLA-Tencor map the optical properties of the disk surface, producing high-resolution grayscale images of surface reflectivity and scattered light. Defects that have been identified in this manner are further characterized according to the morphology. The imprint process was tested after optimizing both the disk cleaning and adhesion layer processes that precede imprinting. Two extended imprint runs were performed and both the defect types and trends are reported.

Cited by 8

Commercialization of bit-patterned media

Ria Esterina · DSpace@MIT (Massachusetts Institute of Technology) · 2009

Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2009.

Cited by 1Open access

MICROMAGNETICS OF COMPOSITE PATTERNED MEDIA

Boris Livshitz, A. Inomata, H.N. Bertram · 2010

Magnetic recording currently is the major data storage technology. Conventional magnetic media implement continuous magnetic layers consisting of microscopic grains. Such media have constraints of thermal instability due to the superparamagnetic effect, which occurs when the magnetic grains become too small. The superparamagnetic effect may set the fundamental limit of about 0.5Tbit/in 2 on achievable

Cited by 0

Resolution of patterned magnetic media

Ki Seog Song · DSpace@MIT (Massachusetts Institute of Technology) · 2000

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.

Cited by 0Open access

Energy barriers in patterned media

Jeroen de Vries · 2013

On the front a scanning electron microscopy image of a patterned media sample with in front of it a magnetic

Cited by 0Open access

Read channels for patterned media

Gordon F. Hughes · IEEE International Magnetics Conference · 1999

Recording channels are proposed for vertical and horizontal 100 Gb/in2 patterned media. The vertical channel uses a single-pole (1P) probe head to write vertical patterned media, and the horizontal configuration uses a two-pole (2P) head on horizontal media.

Cited by 3

Recording potential of bit-patterned media

Hans Richter, Alexander Dobin, R. T. Lynch et al. · Applied Physics Letters · 2006

A comprehensive analysis of the areal density potential of bit-patterned media recording shows that the recording performance is dominated by written-in errors. The statistical fluctuations of the magnetic properties and the locations of the individual bits lead to error probabilities so that some dots are either not recorded at all or cannot be recorded in the time window necessary to ensure synchronized writing. The highest areal densities are obtained with a combination of a pole head, a soft magnetic underlayer, and a storage medium of the composite type. Areal density scenarios of up to 5Tbits∕in.2 are analyzed.

Cited by 147

Write Synchronization in Bit-Patterned Media

Yaw-Shing Tang, Ki-Seok Moon, Hyung Jai Lee · IEEE Transactions on Magnetics · 2009

Writing bit-patterned media has been a challenging problem because it is necessary to synchronize write timing with physical bit-pattern locations on disk. This timing requirement must be addressed not only in disk drives but also in testing environments such as a spin stand. This paper first describes a technique for synchronizing write timing on a spin stand. Testing results show that, with data block length similar to a disk drive sector, the write timing jitter due to synchronization error is much smaller than the magnetic transition jitter. We then discuss the potential timing jitter sources in a disk drive, including disk speed variation, head vibration, and write clock stability. Experimental data show that the head vibration is potentially the most difficult jitter source for the write clock to handle. The possibility and difficulty in applying coding techniques to correct write timing error is also investigated. While it is possible to create codes for this purpose, practical considerations can limit its usefulness.

Cited by 23

Signal and noise characteristics of patterned media

Mustafa M. Aziz, C. David Wright, B.K. Middleton et al. · IEEE Transactions on Magnetics · 2002

Analytical expressions of the replay spectra from single- and multiple-recorded bits in patterned media have been derived. The expressions were extended to include position jitter noise and bit-size variations.

Cited by 15

Magnetic media patterned by laser interference lithography

Murillo Vallejo, Rogelio · University of Twente Research Information · 2006

The scope of this thesis consists on the fabrication and magnetic characterization of CoNi/Pt and Co/Pt patterned films with perpendicular anisotropy with possible applications as an information storage medium. We have realized patterned magnetic nanodots arranged in square and hexagonal lattices with periodicites ranging from 600 nm down to 300 nm, which corresponds to bit densities from 1.8 Gb/sqi up to 7.2 Gb/sqi. The main aim has been focused towards the understanding of the problems involved in the fabrication of large samples (1 × 1 cm till 3 × 3 cm) and their write-ability. We discuss about the magnetic properties of an idealized magnetic pattern medium. Issues as the thermal stability, required magnetic anisotropy, bit to bit interaction and its consequences for the material’s switching field distribution are considered. Laser Interference Lithography has been the technique chosen to produce the patterned media samples studied in this work. A discussion about different photoresist stacks which were used in the course of this work is presented. We also discuss on the etching process and the photoresist removal afterwards. Regarding the magnetic analysis of the samples, three issues are mainly discussed: The possible damage to the magnetic properties of the material due to the fabrication process, in particular the ion beam etching step and the subsequent removal of the residual photoresist. The switching field distribution displayed by the samples and possible ways to reduce it are also discussed. Finally we examine the thermostability of our samples. Difficulties in writing and retrieving actual information are commented and possible lines for further research are sketched.

Cited by 0Open access