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To: killybegs who wrote (1252)	11/18/1997 1:51:00 PM
From: Gus	Respond to of 17679

Dr. Jack Judy's IIST presentation... Thermally-Activated Time-Decay Brickwall Facing Storage of Longitudinal Magnetic Recording Beyond 10 Gigabits/in2 Abstract Longitudinal thin film media designed for an areal storage density of 10 Gigabits/in2 will require thickness and grain diameters approaching 10 nm which will induce significant thermally-activated time-decay of recording data. Measurements of remanent magnetization on a vibrating sample magnetometer and recorded signal output in a spin-stand over times up to 30 hours have shown that there is a significant time-dependent magnetic viscosity or time-decay rate of several percent per decade of time in seconds at a recording density of only 6000 fr/mm. This time-decay brickwall is due to the small thickness, small grain size, and low Crystal anisotropy energy density of standard longitudinal film media. Recording measurements have indicated time-decay in longitudinal media is SIGNIFICANTLY reduced by a magnetic keeper. An ultra-high areal density roadmap study indicates that the brickwall is due to fact that the minimum required cocercity of longitudinal media will have to exceed half its anisotropy field beyond 10 Gb/in2, but a 5-10x thicker perpendicular media with GMR read head should be able to achieve 100-1000 Gb/in2. * caps mine Impressive resume as well at... www-iist.scu.edu