A novel study of head motion hysteresis issues in contact probe recording systems |
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Authors: | Narayanan Ramakrishnan Mark D Bedillion |
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Affiliation: | (1) Research and Technology Development Center, Seagate Technology, 1251 Waterfront Place, Pittsburgh, PA 15222, USA |
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Abstract: | Contact-based recording on ferroelectric media and polymer media have been proposed and investigated for high-density probe
storage. To achieve fast data rate, it is necessary to perform reading or writing with multiple probe heads simultaneously.
However, localized variations in tribological behavior at the contact interface between the probes and recording media and
variation in normal contact force would result in variation in friction and stiction over the interface and therefore amongst
individual heads in the probe head array. This causes variation in the hysteretic motion of the heads over the array, which
in turn results in off-track motion during track-positioning and timing errors during scanning. In this paper a novel method
of modeling these effects is developed to study the effect of relative head-motion hysteresis (RHMH) on timing-error during
data read–write and off-track errors during seek-settle. A mathematical model of RHMH during scanning along the bit-wise direction
is developed based on the idea of stochastic averaging. A transient response model is similarly developed for estimating hysteresis
effects during seek-settle. These models help to understand parametric dependencies of RHMH and can be used in designing the
probe heads, the probe–media interface (PMI) and the probe system in general. Further several schemes involving modulation
of the normal force at the PMI are proposed to mitigate RHMH and their benefits are analyzed using the models described in
this paper. |
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