Bit-patterned perpendicular magnetic medium (BPM) is a strong candidate for extending the thermal stability limit of current granular media [1]. Since all of the bits are pre-fabricated, the physical structure is fundamentally different from conventional media. Therefore, the write/read scheme must be totally re-established. The necessary control parameters to maximize the recording density are different from conventional granular media. They should be extracted and examined in order to optimize the recording performance. So far, it has been known that the recording characteristics is governed by various patterning fluctuations, such that the major media noise source is the dispersion of patterned dots [2]. The statistical characteristics of these fluctuations are therefore important. In this work, the influence of various fluctuations is discussed to determine the appropriate writing process, based on a recording model of BPM. Variations of media parameters and write head field distribution are major factors for this discussion. Computer simulations were used to demonstrate the effectiveness of the model by maximizing the areal recording density through optimization of the media fabrication and recording conditions.
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