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Inmeasurementsoftimedecayinaperpendiculardouble layeredmedium ,alargeoutputdecaywasobservedwhenaregularsingle poleheadwasusedforbothwritingandreading .Investigationsofthisphenomenonrevealedthatthedemagnetizationofthemediumwascausedbytheinstabilityofthedomainwallofthemainpolefilmandalsobytheconcentrationofstrayfieldsbythemainpoleduringthereadingprocess.Severalcountermeasureswereproposed .
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