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Large Area and Low Aspect Ratio Linear Magnetic Tunnel Junctions With a Soft-Pinned Sensing Layer

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5 Author(s)
Ferreira, R. ; INL-Int. Iberian Nanotechnol. Lab., Braga, Portugal ; Paz, E. ; Freitas, P.P. ; Wang, J.
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Large area MTJs with linear response and very larger sensitivities are needed to fulfill the requirements for the detection of pT/Hz0.5 magnetic fields at low frequency and room temperature. MTJ stacks with soft-pinned sensing layers have been developed and the stack was optimized, providing a tunable soft-pinning field over a large range of values. Sensitivities corresponding to resistance changes of up to 7%/Oe are obtained in patterned MTJs with areas of 20 × 20 μm2 starting from films with high sensitivity soft-pinned layers made from 3.0Co40Fe40B20/0.21Ta/8.0Ni81Fe19/8.0Ir20Mn80.

Published in:

Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )

Date of Publication:

Nov. 2012

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