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Improved algorithm and method for characterizing instability and write-induced magnetic center shifts for MR head

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1 Author(s)
Guo Mian ; Samsung Inf. Syst. of America, San Jose, CA, USA

We have developed new algorithms and methods for characterizing a write-induced magnetic read center shift for MR heads from on-track and off-track readback signals. Mechanisms for the instability can be characterized by a cross correlation coefficient of VA and V c, r[VA,VC], where VA and V C are half track amplitudes (50 % off-track) of signals reading from two adjacent servo-burst-like bursts A and C. Instabilities of the head resulting purely from changes in the read sensitivity of the MR head bring about a unity of the coefficient. Instabilities of the head resulting purely from shifts of the magnetic read center bring about a negative unity of the coefficient. A correlation function developed in this work correlates with the shift of the MR read center well

Published in:

Magnetics, IEEE Transactions on  (Volume:32 ,  Issue: 5 )