ArticleJournal of physics D: Applied physics2026
Reassessing magnetic tunnel junction detectability for ultrasensitive sensing using small-field sensitivity and Jiles-Atherton modeling.
Article in Journal of physics D: Applied physics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- Reassessing magnetic tunnel junction detectability for ultrasensitive sensing using small-field sensitivity and Jiles-Atherton modeling.Journal of physics D: Applied physics · 2026Article
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4 authors.
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Abstract
Magnetic tunnel junction (MTJ) sensors are attractive for detecting extremely small magnetic fields, yet their performance is often quantified using sensitivities derived from major loops or larger-field minor loops which inherently include hysteretic contributions. As a result, these conventional metrics significantly overestimate detectability by including irreversible processes that vanish in the small-field limit. Here, we systematically measure the low-field response of uniaxial MTJs under both ac and dc magnetic excitation and demonstrate a distinct transition from hysteretic to fully reversible behavior as the field amplitude is reduced. By adapting the Jiles-Atherton model to analyze MTJ conductance, we establish a unified framework that captures magnetization processes down to nanotesla range, yielding quantitative parameters that resolve reversible and irreversible dynamics with excellent fidelity. In the reversible regime, the sensitivity converges to a constant value of 0.55%Oe
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