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Technology Stocks : Ampex Corporation (AEXCA)

AMPX 12.44

-8.4%

Jan 30 9:30 AM EST

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To: Gus who wrote (720)	9/19/1997 4:17:00 PM
From: Chris Elsass	of 17679

Gus, Great Post, A magnetic flux must be applied to the keepered layer in order to saturate the layer. Once the magnetic flux within the keeper layer is saturated, the signal flux is expelled and effectively couples with the read head. The KM layer directs the signal flux to the read head. The magnetic flux that is supplied to the keepered layer can be done by either 1) By adding another wire (KM + TFI) 2) By using the biasing scheme inherent in the MR design(SAL MR) 3) By using permanent magnets either within the read head or close by. 4) Any other method someone imagines to apply a saturating flux to the KM layer (I do not know of any other) This will work with MR, GMR, or whatever magnetic head and hard magnetic medium you want to use. The engineering difficulties with the SAL MR Head or Gus's MR Head can be solved, they just need the money and time to do it. The themal stability issue is huge when increasing the areal density. This ultimately may force people to use KM. But that is still a few years off. It's just a matter of time. Chris

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