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Exchange coupling between ferromagnetic and antiferromagnetic layers via Ru and application for a linear magnetic field sensor

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5 Author(s)
Dexin Wang ; NVE Corporation, 11409 Valley View Road, Eden Prairie, Minnesota 55344 ; Daughton, Jim ; Nordman, C. ; Eames, Pete
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Exchange coupling is observed in a trilayer structure of ferromagnet-Ru-antiferromagnet and the coupling strength is found to be a function of the thickness of the Ru spacer layer. This is the first observation for such a trilayer structure and may help to shed light on the illusive mechanism of exchange coupling in these systems. This unique coupling is used to bias the sense layer in a magnetic tunnel junction structure so that the magnetization orientations of the sense layer and the pinned layer can be independently controlled. Sensor devices are fabricated with a bipolar output, a medium sensitivity, and a wide field range. The results show that this biasing scheme is well suited for magnetic tunnel junctions used in magnetic field sensors.

Published in:

Journal of Applied Physics  (Volume:99 ,  Issue: 8 )