NDLI: Flying Height Modulation for a Dual Thermal Protrusion Slider in Heat Assisted Magnetic Recording (HAMR)

Content Provider	IEEE Xplore Digital Library
Author	Xiong Shaomin Bogy, D.B.
Copyright Year	1965
Abstract	Thermal flying-height control (TFC) technology has been used in the last few years in hard disk drives (HDDs) to achieve a lower flying height for higher storage areal density. In this paper a slider with dual thermal protrusions, one produced by the laser used to heat the disk in HAMR and the other one used for TFC, is studied. The flying height modulations (FHM) due to disk waviness and external disturbances are compared for the dual protrusions, single protrusion and no protrusion sliders. The protrusions provide additional force and torque excitation to the slider. The protrusions can be viewed as a passive feedback loop to compensate the disturbance. The gain of the feedback loop depends on the stiffness of the protrusions, which is determined by the protrusions' heights and positions. Thus the complicated air bearing slider system with protrusions is simplified by casting the protrusion perturbation as a feedback loop and this simplified model helps to speed up the optimization of the TFC protrusion height and position. The numerical simulation results show that FHM of the dual protrusion slider is reduced significantly when the TFC protrusion height and location are optimized. External disturbance induced FHM can be suppressed as well. This scheme for dual protrusion optimization and analysis described in the work can benefit HAMR head design because the optimized dual protrusion provides a more consistent flying height and a greater ability to compensate external disturbances.
Sponsorship	IEEE Magnetics Society
Starting Page	5222
Ending Page	5226
Page Count	5
File Size	721701
File Format	PDF
ISSN	00189464
Volume Number	49
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	thermal fly-height control (TFC) Flying height modulation (FHM) heat assisted magnetic recording (HAMR)
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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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
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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Alternate air bearing slider designs for areal density of 1 Tb/in/sup 2/

Numerical Simulation of a Thermal Flying Height Control Slider With Dual Heater and Insulator Elements

Investigations of Light Contact and Lube-Surfing State With Electrical Current

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