STRIPLINE MAGNETIC WRITING OF DYNAMIC MAGNETIC DATA BITS IN SURROUNDING REGIONS OF STATIC MAGNETIC DATA BITS

摘要

A magnetic device comprises a magnetic stripe for recording a combination of dynamic and static magnetic data. The magnetic stripe comprises at least two regions of material with substantially different coercivities. A first of these regions includes a relatively high coercivity material into which the static magnetic data will be originally recorded by a relatively strong magnetic recording head external to the magnetic device. An array of bit striplines underlies a second of the two regions of material with relatively low coercivity, and is able to produce magnetic fields sufficient to write the dynamic magnetic data in such low coercivity material. The bit stripline may also underlie the first region of relatively high coercivity material, but the magnetic fields it can generate are not strong enough to affect the static magnetic data. The bit stripline is built up from many parallel sections of conductor. A capacitor is charged to a voltage high enough to generate a current through each bit stripline switched on one at a time. The current pulses through each stripline conductor section produce magnetic writing pulses to the adjacent second region of low coercivity material. Thus new data can be written to the dynamic magnetic data. An external reader will thereafter be able to read out a combination of the dynamic and static magnetic data.