Abstract
A comparative analysis of tape heads with two spin-valve designs is presented: spin valves with synthetic free and pinned layers (SF-SAF/AF) versus spin valves with a conventional free layer and a synthetic pinned layer (SAF/AF). The SF layer, corresponding to a smaller free layer's effective magnetic thickness (t/sub eff,SF/ /spl sim/ 28 /spl Aring/) and lower magnetic moment (M/sub eff,SF/ /spl sim/ 398 emu/cc), is more sensitive to the field flux from the medium and has a higher sensitivity (/spl sim/ 3.4 mV//spl mu/m) than the conventional NiFe/CoFe free layer, with D50 /spl sim/ 130-138 kfci, in comparison with D50 /spl sim/ 99 kfci for SAF/AF spin-valve heads. Thick media limitations become visible on the heads' performance above /spl sim/ 112 kfci and the heads are shown to be mostly time-instability free.
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