Impact of write current wave form on high frequency magnetic recording

In this article, we present an experimental study of the impact of the writ e current wave form on high frequency magnetic recording. It has been found that, at high recording frequencies, current overshoot reduces transition broadening, overwrite degradation, and nonlinear transition distortion. Res ults show that, to achieve fast flux reversal time, increasing write curren t overshoot is more effective and efficient than increasing write current a mplitude. While overdriving the write head may bring the head into deep sat uration, and introduces additional nonlinear transition shift, current over shoot significantly eliminates this nonlinear transition distortion by achi eving fast head field rise time yet preventing the write head from deep sat uration. (C) 1999 American Institute of Physics. [S0021-8979(99)72108-0].