Title :
Comparison of time-decay of read-back signals in keepered and non-keepered media
Author :
Chen, Jinghuan ; Judy, Jack H. ; Coughlin, Thomas M.
Author_Institution :
Dept. of Electr. & Comput. Eng., Minnesota Univ., Minneapolis, MN, USA
fDate :
7/1/1998 12:00:00 AM
Abstract :
Soft sendust keeper layer has been sputtered on top of longitudinal thin film media which has an Mrt value of 0.49 memu/cm2. Measurements of time-decay in both keepered and non-keepered longitudinal thin film media have been performed on a spin-stand tester. Experimental results showed that time-decay is larger in tested media which has lower Mrt values compared to those that have a larger Mrt of 1.26 memu/cm2. A 50 Å thick sendust keepered media has about half the decay rate compared to its non-keepered counterpart (Mrt=0.49 memu/cm 2) at a recording density of 6000 fr/mm. Also, it was found that time-decay in 100 Å and 150 Å thick keepered media is less than that in a 50 Å keeper media
Keywords :
demagnetisation; magnetic recording; keepered media; longitudinal thin film media; nonkeepered media; read-back signals; recording density; soft sendust keeper layer; spin-stand tester; time-decay; Demagnetization; Magnetic films; Magnetic materials; Magnetic memory; Magnetic recording; Material storage; Performance evaluation; Sputtering; Testing; Time measurement;
Journal_Title :
Magnetics, IEEE Transactions on
