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Title: A novel method for reduction of the cross track profile asymmetry of mr head during self servo-writing
Authors: Liu, B. 
Hu, S.-B. 
Chen, Q.-S.
Keywords: Asymmetry
Cross track profile
Mr head
Self servo-writing
Skew angle
Issue Date: 1998
Citation: Liu, B., Hu, S.-B., Chen, Q.-S. (1998). A novel method for reduction of the cross track profile asymmetry of mr head during self servo-writing. IEEE Transactions on Magnetics 34 (4 PART 1) : 1901-1903. ScholarBank@NUS Repository.
Abstract: Cross track profile is used to provide head positioning signal during self servo-writing process. A symmetric off-track profile is preferred in this case. The asymmetry of the cross track profile of SAL biased MR head is characterized in this work referring to the point at which the MR head is at the track center. Results indicate that the profile can be rather asymmetrical for some MR heads. Different MR heads correspond to different degrees of asymmetry. Different skew angles also exhibit different degrees of asymmetry, even for the same MR head. As a result, the positioning accuracy of a MR heiid during self servo-writing is affected. A novel method is presented in this work. Instead of keeping the bias current in a fixed direction, the new method uses bias current in both positive and negative directions for the readback of the positioning bursts. Results indicate that the new method can reduce both the asymmetry and the variation of the profile at different skew angles, and improve the uniqueness of the normalized cross track profile significantly. © 1998 IEEE.
Source Title: IEEE Transactions on Magnetics
ISSN: 00189464
DOI: 10.1109/20.706737
Appears in Collections:Staff Publications

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