- Title
- Achieving subnanometer precision in a MEMS-based storage device during self-servo write process
- Creator
- Sebastian, Abu; Pantazi, Angeliki; Moheimani, S. O. Reza; Pozidis, Haris; Eleftheriou, Evangelos
- Relation
- IEEE Transactions on Nanotechnology Vol. 7, Issue 5, p. 586-595
- Publisher Link
- http://dx.doi.org/10.1109/tnano.2008.926441
- Publisher
- Institute of Electrical and Electronics Engineers (IEEE)
- Resource Type
- journal article
- Date
- 2008
- Description
- In probe-based data storage devices, microelectromechanical system-based microscanners are typically used to position the storage medium relative to the read/write probes. Global position sensors are employed to provide position information across the full scan range of these microscanners. However, to achieve repeatable positioning, it is also necessary to have medium-derived position information. Dedicated storage fields known as servo fields are employed to obtain this medium-derived position information. The servo-patterns on these servo fields have to be written using the global position sensors prior to the regular operation of the storage device by employing a scheme known as ldquoself-servo writerdquo process. During this process, subnanometer positioning resolutions, well below that provided by the global position sensors, are desirable. Such precise positioning at acceptable bandwidth requires the directed design of the closed-loop noise sensitivity transfer function so as to minimize the impact of sensing noise. This paper describes control architectures in which the impact of measurement noise on positioning is minimal while providing satisfactory tracking performance. It is estimated that the positioning error due to sensing noise is a remarkably low 0.25 nm. Experimental results are also presented that show error-free operation of the device at high densities.
- Subject
- H∞ controllers; nanopositioning; precision positioning; probe-based data storage; resonant controllers; servo write process
- Identifier
- http://hdl.handle.net/1959.13/38985
- Identifier
- uon:4396
- Identifier
- ISSN:1536-125X
- Rights
- Copyright © 2008 IEEE. Reprinted from IEEE Transactions on Nanotechnology. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Newcastle's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
- Language
- eng
- Full Text
- Reviewed
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