THE DOMAIN-WALL DISTORTION OF MAGNETICALLY WRITTEN BITS IN GDTBFE THIN-FILMS

The distortion of the bits which are formed by a magnetic head has been studied on GdTbFe films. From read/write tests, it is found that reproduction noise is strongly affected by the film sputtering gas pressure (0.2-0.6Pa); high Ar pressure causes less reproduction noise. Jitter analysis with a magneto-optical read head indicates that domain wall distortion decreases as the deposition pressure increases. This distortion amplitude is found to roughly coincide with the distance between iron microcrystallites (about 10Å to 60A in diameter) which are assumed to provide nucleation sites for magnetization reversal. © 1990 IEEE