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Technology Stocks : Ampex Corp: Digital Storage

AMPX 9.485

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To: lostmymoney who wrote (1908)	2/20/1997 5:29:00 PM
From: Gus	of 3256

Who is J. Chen? He is Robin to Dr. Jack Judy's Batman over at the University of Minnesota MINT, which we know continues to participate in studies regarding keepered media. Note the work he is doing with MR and GMR recording. ee.umn.edu:80/users/jchen/research/projects.html Research Projects Project 1 Preparation and recording performance testing of keepered media The basic keepered media structure is soft material/break layer/storage media. The main advantages of keepered media are amplitude gain, PW50 reduction of read-back signal, error rate improvement, and less thermal decay. However, it also has disadvantages such as more complicated noise. A PE2400 sputtering system was used to fabricate the keeper and break layer. A Cambrian spin-stand was used to test the recording performance of keepered disks. An Atomic Force Microscope (AFM) was used to study the role of bias current applied during read-back. Sendust and CoZrNb were experimentally studied as alternative keeper materials to NiFe. The thickness of keeper & break layers and the bias current were optimized to obtain the best recording performance. Please see the Intermag `97 abstracts summarizing this work. Project 2 Spin-stand measurement of time decay in thin film media In future ultra-high density storage media, the thermal decay effect will be much larger than current media because of its decreasing thickness. Some low Mrt disks were tested on a Cambrian spin-stand in order to study the relationship between decay and recording system properties such as media Mrt, thickness, and linear density. To solve the problem of head drift, a track-profile method was used to measure the decay of read-back signals. One of the experimental results is showed below: Static time decay in low Mrt media samples was also measured by using a VSM. The results are generally in agreement with those taken from a spin-stand. Part of the work in this project will be presented at Intermag `97. Project 3 Study of GMR head materials (NiO/NiFe) NiO/NiFe and NiO/NiFe/Co GMR structures were sputtered by using a PE2400 sputtering system. An Exchange Field/Coercivity ratio of about 6 was achieved. The GMR ratio of the NiO/NiFe/Co/Cu/Co/NiFe structure was about 4%.

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