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To: Sal Davis who wrote (1169)	11/7/1997 8:30:00 AM
From: Sean	Read Replies (3) \| Respond to of 17679

Let's get back to the information/research here. Please everyone, check your ego at the door. I'm attempting to put together some posts re the KM R&D players, i.e. Beverly Gooch, Jack Judy, Tom Coughlin. Here's some preliminary info I've found. Some of this could be redundant, if so, my apologies. As we already know, KM will help increase areal density as well as to help overcome thermal decay as even higher densities are reached. Prof. Jack Judy lists this as a "proposed area of study" as this excerpt from the U of Min. MINT page shows. ee.umn.edu Excerpt: 6.Soft Keeper to Prevent Thermally-Activated Decay of Recording in Longitudinal Thin Film Media (Jack Judy, John Sivertsen, MINT, TEL: 612-625-7381) As areal storage densities of longitudinal magnetic recording media is increased beyond 5 Gigabit/in2, it is proposed to use a multilayer overlayer of a magnetic sendust keeper to prevent decay of the remanent magnetizations of UHDR recorded bits through thermally-activated magnetic after-effect-induced switching of magnetic domains clusters. Keepered longitudinal media exhibits increased signal output, decreased isolated pulse widths, pulse shape and amplitude asymmetry, and increased bit-shift margins. This work is ongoing and was presented here, at the Oct. 6th 1997 MINT research review: ee.umn.edu Excerpt: 8:30-10:00 A.M. -- Thin Film Media, Heads, and Tribology Overview of research activities, Prof. Jack Judy Study of time decay of Mr of ultra-high density recording thin film media, Dehua Han Comparison of time decay between keepered and nonkeepered thin film media, Jinghuan Chen Calculated effect of grain size distribution on time decay of thin film media, Cheng Yang Magnetic behavior of RF sputtered NiFe/NiO bilayers, Zhenghong Qian Saturation magnetostriction of Co/NiFe and NiFe/Co RF sputtered bilayers, Prof. Jack Sivertsen And over wine and cheese they demonstrated: EE/CSci 6-140 -- Recording performance and time decay of keepered thin film media EE/CSci 6-138 -- VSM measurement of temperature dependence of coercivity of thin film media We also know that there was a presentation in Japan on Oct. 21st, as has been reported w/ a link previously. For a short history of Jack Judy's research and a picture of the man, go to: ee.umn.edu Now, we know that MR + KM is in the transition from lab to commercial implementation. Tom Coughlin will be talking about just that next month as the chairman of Magnetic Media Symposium II on Dec 15th and 16th. (Jack Judy will also be speaking): www-iist.scu.edu www-iist.scu.edu Excerpt: The wide-spread use of low noise MR heads and channels as well as increasing areal densities has increased the demands on magnetic recording media. Soft magnetic materials incorporated into the structure of magnetic hard disks has been shown to enhance performance areal density using inductive heads. For applications with MR heads some of these inductive results also apply, particularly e effects such as reduced noise and erase bends at the track edges. The reduction of demagnetization of the recorded transition results in a narrower transition length and a significant improvement in the thermal stability of the recording resolution, decrease adjacent track pick-up and reduce the media noise. These phenomena will bring soft magnetic layers to all magnetic recording media in the next few years and ill be important in the achievement of high BPI and TPI MR head recording systems. Note and question: The closing sentence "these phenomenon will bring...", sounds interesting but I'm not sure if he's refering to the SAL (soft adjacent layer) MR technology that is already in use, or is he referring to KM? I'm trying to keep the rose colored glasses off here. It looks like Jubimer's theory of a "pay me now or pay me later" strategy is playing out IMHO. Now, the question is, how do we smuggle someone in there on the 15th and 16th! It's 325 bucks to register. I didn't see anything that listed special requirements to attend! Anyone? Sean