EXPERIMENTAL-STUDY OF RECORDING PERFORMANCE OF SENDUST AND COZRNB KEEPERED THIN-FILM MEDIA

Sendust and CoZrNb were sputtered on longitudinal CoCr12Ta2 thin film media as alternative keeper materials to NiFe, Experiments were perfor med to study the dependence of recording performance on the thickness of the keeper and Cr break layer, head bias current, and recording den sity, It was found that a thinner (50 Angstrom) CoZrNb keepered media can achieve the same amplitude improvement as obtained by a 150 Angstr om thick sendust keeper, Spin-stand time decay measurements show that Sendust keepered media has a significantly lower decay rate (1.1% per decade) than its unkeepered counterpart (2.8% per decade), A magnetic force microscope (MFM) was used to observe the flux from transitions u nder a 50 Angstrom and 250 Angstrom keeper layers when a external magn etic field of 60 Oe is applied.