Large area MTJs with linear response and very larger sensitivities are needed to fulfill the requirements for the detection of pT/Hz0.5magnetic 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\,×\,20μm²starting from films with high sensitivity soft-pinned layers made from 3.0 Co₄₀Fe₄₀B₂₀/0.21 Ta/8.0 Ni₈₁Fe₁₉/8.0 Ir₂₀Mn₈₀.
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Ferreira et al. (2012) studied this question.
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