Abstract
In perpendicular magnetic recording, reduction of nonlinear distortion is necessary in order to achieve a higher areal density as well as to improve the signal-to-noise ratio. CoPtCr-SiO2 perpendicular magnetic recording media with various SiO2 contents were used to examine nonlinear distortion mechanisms and optimization of pre-compensation was investigated by the 5th harmonic method. The results showed that the nonlinear distortion was caused by nonlinear transition shift (NLTS) and nonlinear amplitude distortion caused by transition percolation. This was supported by micro-track model calculations. Therefore, the pre-compensation values should be optimized by taking both nonlinearities into account.
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