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Overwrite in thin film disk recording systems

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3 Author(s)
Lin, G.H. ; Center for Magnetic Recording Res., California Univ., San Diego, La Jolla, CA, USA ; Zhao, Yang ; Bertram, H.N.

Overwrite in thin film rigid disk recording is studied experimentally using disks with a wide range of magnetic moment and coercivity. Standard f2/f1 overwrite is investigated in detail at various recording currents and different flying heights. A theoretical model is developed using simple analytical approximations that relate demagnetization-field-induced position shift (hard transition shift) to the measured overwrite. The demagnetization fields due to the leading edge transitions are calculated analytically including a good approximation to the gapped head image. The results compare well with experimental measurements. A new overwrite measurement technique using the second harmonic component of a 0.5f1, signal is also described

Published in:

Magnetics, IEEE Transactions on  (Volume:29 ,  Issue: 6 )