Pattern peak‐shifts due to the interference of adjacent magnetization transitions in digital recording are one of the main causes of limiting its recording density. This paper aims to supply design data on pattern peak‐shifts, giving experimental data of peak‐shift in various transition patterns, and comparing them with the calculated results obtained from the superposition of isolated read signals. A magnetic tape system was used in which a nonlinear interference effect occurs easily during the write process.
The relationship between the peak‐shift in a magnetic transition pattern Δx and the minimum magnetic transition interval b is given in a normalized graph coordinated by Δx/b and b/(W50/2), where W50 is the half‐width of an isolated read signal. For example, the design value of b/(W50/2) for required value of Δx/b ≤ 25% is about 1.3, 1.0 and 1.2 or greater for the NRZ‐I, FM and MFM code systems, respectively. The nonlinear interference in a recording process occurs so that each magnetization transition is pushed toward the direction of medium motion. In a region where this effect occurs strongly, the calculated results do not agree with the actual ones.
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