NDLI: Fabrication and characterization of bit patterned media at 1.5 $Tdots/in^{2}$ and beyond

Content Provider	IEEE Xplore Digital Library
Author	Lee, K.Y. Yang, X. Xiao, S. Hsu, Y. Yu, Z. Feldbaum, M. Steiner, P. Wago, K. Li, N. Kuo, D.
Copyright Year	2015
Description	Author affiliation: Seagate Enterprise Storage Drive Archit., Shakopee, MN, USA (Li, N.) \|\| Seagate Media Res., Fremont, CA, USA (Lee, K.Y.; Yang, X.; Xiao, S.; Hsu, Y.; Yu, Z.; Feldbaum, M.; Steiner, P.; Wago, K.; Kuo, D.)
Abstract	Summary form only given. Continuing areal-density growth is critical for the hard disk drive industry to meet the increasing demand in data storage, and to improve costs. Heat-assisted magnetic recording (HAMR) is expected to be introduced in products as perpendicular magnetic recording (PMR) approaches its limitations in areal density growth. Beyond this, bit patterned media (BPM) recording is considered to provide a path for areal density growth above the limits imposed by granularity in PMR and HAMR media. In BPM, one bit of information is stored in a lithographically defined dot with typical dimension in the order of a few nanometers. Thus, BPM presents extreme challenges to lithography because of the small feature size required for high areal density. Moreover, very tight dot size and spacing tolerance control, and incorporation of servo features are critical to facilitate recording with a transducer. BPM fabrication starts with patterning of the dots in quartz wafers to form templates for nano-imprint lithography (NIL). At Seagate, patterning of such templates by directed self-assembly (DSA) of block copolymers has been demonstrated as a viable lithography approach for areal density up to 5 Tdpsi. A mix-and-match DSA and conventional lithography scheme has been successfully developed for fabricating imprint templates, each comprising regular arrays of dots in data sectors, and non-periodic dot patterns in servo sectors. Templates with fully integrated servo patterns and with areal density of up to 2 Tdpsi (Figure 1) have been fabricated. Subsequent media fabrication involves transferring the BPM features from a template into magnetic thin films by NIL and ion-beam etching. Using this approach, BPM media with fully functional integrated servo features has been successfully fabricated on 2.5” disks with areal density of up to 1.5 Tdpsi. On spin-stand, BER of 3.7 × $10^{-3}$ has been measured on 1 Tdpsi BPM disks, whilst the best write error rate recorded at 1.5 Tdpsi BPM currently stands at $2.5×10^{-2}$ (Figure 2). Although significant milestones have been achieved in BPM technology, many challenges still remain, principally in recording margin, patterning to meet skew requirement, density extensibility, dot morphology control, and magnetic material limitations. Possible solutions such as patterned rectangular bits with lamellae-forming BCP and double patterning process, and heated dot magnetic recording (HDMR) will be discussed. At system level, integration challenges from drive architecture perspective will also be addressed.
Starting Page	1
Ending Page	1
File Size	413817
Page Count	1
File Format	PDF
e-ISBN	9781479973224
DOI	10.1109/INTMAG.2015.7157276
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-05-11
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Media Servomotors Fabrication Lithography Heat-assisted magnetic recording Error analysis Drives
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Fabrication and Recording of Bit Patterned Media Prepared by Rotary Stage Electron Beam Lithography

Temperature and Electromagnetic Field Distributions of Heat-Assisted Magnetic Recording for Bit-Patterned Media at Areal Density beyond 6 Tb / in 2

Fabrication and characterization of bit-patterned media beyond 1.5 Tbit/in2.

Signal processing for bit-patterned media and heat-assisted magnetic recording systems with media noise (2012).

Simulation of Expected Areal Density Gain for Heat-Assisted Magnetic Recording Relative to Other Advanced Recording Schemes

Patterned magnetic recording media

Heat assisted magnetic recording of bit patterned media beyond 10 Tb/in$^2$

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

Recording on Bit-Patterned Media at Densities of 1 Tb/in$^2$and Beyond

Fabrication and characterization of bit patterned media at 1.5 $Tdots/in^{2}$ and beyond

Similar Documents

Fabrication and Recording of Bit Patterned Media Prepared by Rotary Stage Electron Beam Lithography

Temperature and Electromagnetic Field Distributions of Heat-Assisted Magnetic Recording for Bit-Patterned Media at Areal Density beyond 6 Tb / in 2

Fabrication and characterization of bit-patterned media beyond 1.5 Tbit/in2.

Signal processing for bit-patterned media and heat-assisted magnetic recording systems with media noise (2012).

Simulation of Expected Areal Density Gain for Heat-Assisted Magnetic Recording Relative to Other Advanced Recording Schemes

Patterned magnetic recording media

Heat assisted magnetic recording of bit patterned media beyond 10 Tb/in$^2$

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

Recording on Bit-Patterned Media at Densities of 1 Tb/in$^2$and Beyond

Fabrication and characterization of bit patterned media at 1.5 $Tdots/in^{2}$ and beyond