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

Volume

34

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

1624

Lastpage

1626

Abstract

Soft sendust keeper layer has been sputtered on top of longitudinal thin film media which has an M_rt 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 M_rt values compared to those that have a larger M_rt of 1.26 memu/cm². A 50 Å thick sendust keepered media has about half the decay rate compared to its non-keepered counterpart (M_rt=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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.706636

Filename

706636