垂直磁気記録における非線形ひずみの解析

抄録

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 5^th 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.