Gmr Multihayer Patterned Structures
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ABSTRACT Co-Cu-NiFe-Cu weakly coupled multilayers, were patterned into stripes with dimensions from lx6jtm 2 to 2x20iim 2 . After proper biasing using a DC field created by an adjacent bias conductor, these structures show large linear field spans (±1500e), with MR values up to 6%. These can be used for current or position sensor applications. Sensor response to AC fields was studied up to 1Mhz, using the bias conductors as sources of the AC field. We find that the signal output is reduced above 10 to 100kHz. For comparison, sensors were also fabricated out Co-Cu AF-coupled multilayer (3xlOOtm 2 structures) needed for field detection up to several kOe.
INTRODUCTION GMR (giant magnetoresistance) multilayers have been develloped in the recent years in view of applications in the magnetic digital recording(Hs
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