Exchange-Biased multi-ring Planar Hall Magnetoresistive Sensors with nT resolution in Non-Shielded Environments
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arXiv
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2025
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| author | Schmidtpeter, Jan Das, Proloy Taran Zabila, Yevhen Schubert, Conrad Gundrum, Thomas Wondrak, Thomas Makarov, Denys |
| author_facet | Schmidtpeter, Jan Das, Proloy Taran Zabila, Yevhen Schubert, Conrad Gundrum, Thomas Wondrak, Thomas Makarov, Denys |
| contents | Planar Hall magnetoresistive sensors (PHMR) are promising candidates for various magnetic sensing applications due to their high sensitivity, low power consumption, and compatibility with integrated circuit technology. However, their performance is often limited by inherent noise sources, impacting their resolution and overall sensitivity. Here the effect of three bilayer structures NiFe(10 nm)/IrMn(10 nm), NiFe(30 nm)/IrMn(10 nm), and NiFe(30 nm)/IrMn(20 nm) on noise levels is investigated at low-frequency (DC - 25 Hz). This study includes a detailed investigation on the optimization process and noise characteristics of multiring PHMR sensors, focusing on identifying and quantifying the dominant noise sources. The experimental measurements are complemented by a theoretical analysis of noise sources including thermal noise, 1/f noise, intermixing and environmental noise. The best magnetic resolution is observed for the NiFe(30 nm)/IrMn(10 nm) structure, which achieves a detectivity below 1.5 nT/sqrt(Hz) at 10 Hz in a non-shielded environment at room temperature. In addition, a substantial improvement in sensitivity is observed by annealing the sensors at 250 deg C for 1 hour. The findings of this study contribute to a deeper understanding of noise behavior in PHMR sensors, paving the way for developing strategies to improve their performance for demanding sensing applications at low frequencies. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_06041 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exchange-Biased multi-ring Planar Hall Magnetoresistive Sensors with nT resolution in Non-Shielded Environments Schmidtpeter, Jan Das, Proloy Taran Zabila, Yevhen Schubert, Conrad Gundrum, Thomas Wondrak, Thomas Makarov, Denys Strongly Correlated Electrons Applied Physics Planar Hall magnetoresistive sensors (PHMR) are promising candidates for various magnetic sensing applications due to their high sensitivity, low power consumption, and compatibility with integrated circuit technology. However, their performance is often limited by inherent noise sources, impacting their resolution and overall sensitivity. Here the effect of three bilayer structures NiFe(10 nm)/IrMn(10 nm), NiFe(30 nm)/IrMn(10 nm), and NiFe(30 nm)/IrMn(20 nm) on noise levels is investigated at low-frequency (DC - 25 Hz). This study includes a detailed investigation on the optimization process and noise characteristics of multiring PHMR sensors, focusing on identifying and quantifying the dominant noise sources. The experimental measurements are complemented by a theoretical analysis of noise sources including thermal noise, 1/f noise, intermixing and environmental noise. The best magnetic resolution is observed for the NiFe(30 nm)/IrMn(10 nm) structure, which achieves a detectivity below 1.5 nT/sqrt(Hz) at 10 Hz in a non-shielded environment at room temperature. In addition, a substantial improvement in sensitivity is observed by annealing the sensors at 250 deg C for 1 hour. The findings of this study contribute to a deeper understanding of noise behavior in PHMR sensors, paving the way for developing strategies to improve their performance for demanding sensing applications at low frequencies. |
| title | Exchange-Biased multi-ring Planar Hall Magnetoresistive Sensors with nT resolution in Non-Shielded Environments |
| topic | Strongly Correlated Electrons Applied Physics |
| url | https://arxiv.org/abs/2504.06041 |