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Picotesla field sensor design using spin-dependent tunneling devices
Abstract
Pinned spin-dependent tunneling devices were fabricated and tested in a mode suited for low-field sensing. The basic structure of the devices was NiFeCo125/Al2O325/CoFe70/Ru9/CoFe70/ FeMn125 (in Å). This structure had a tunneling resistivity of 110 MΩ μm2 and exhibited a 20% magnetoresistance when a field was swept along the easy direction of the soft electrode. High sensitivity, low hysteresis operation was achieved by applying a bias field orthogonal to the easy axis. A sensitivity of 3%/Oe with negligible hysteresis was observed using this mode of operation. A sensor using this type of material was designed to achieve a minimum resolvable field in the picotesla range. The sensor consists of a bridge with four elements, each having 16 tunnel junctions in series. A signal-to-noise ratio of 1:1 at 1 pT (10−8 Oe) is possible assuming achievable values for the tunneling resistivity, device size, bias level, and sensitivity.
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Cited by
Magnetoresistive Sensor Development Roadmap (Non-Recording Applications)
Zheng, C., Zhu, K., Cardoso de Freitas, S., Chang, J.-Y., Davies, J. E., Eames, P., Freitas, P. P., Kazakova, O., Kim, C., Leung, C.-W., et al. (2019) · IEEE Transactions on Magnetics · doi:10.1109/tmag.2019.2896036 · Cited by 268
Sub-pT magnetic field detection by tunnel magneto-resistive sensors
Oogane, M., Fujiwara, K., Kanno, A., Nakano, T., Wagatsuma, H., Arimoto, T., Mizukami, S., Kumagai, S., Matsuzaki, H., Nakasato, N., et al. (2021) · Applied Physics Express · doi:10.35848/1882-0786/ac3809 · Cited by 110
Tunnel-magnetoresistance sensors with sub-pT detectivity for detecting bio-magnetic fields
Nakano, T., Fujiwara, K., & Oogane, M. (2025) · Applied Physics Letters · doi:10.1063/5.0263879 · Cited by 22
Metadata
- Authors
- Tondra, M., Daughton, J. M., Wang, D., Beech, R. S., Fink, A., & Taylor, J. A.
- Venue
- Journal of Applied Physics
- Publisher
- AIP Publishing
- Published
- 1998-06-01
- Volume
- 83
- Issue
- 11
- Pages
- 6688-6690
- ISSN
- 0021-8979 (ISSN-L)
- 1089-7550
- OpenAlex
- W2029210868
- Cited by
- 161
- References
- 0
- FWCI
- 15.07
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Picotesla field sensor design using spin-dependent tunneling devices. https://app.cochat.ai/papers/10.1063/1.367861
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- Tondra, M., Daughton, J. M., Wang, D., Beech, R. S., Fink, A., & Taylor, J. A. (1998). Picotesla field sensor design using spin-dependent tunneling devices. Journal of Applied Physics. https://doi.org/10.1063/1.367861
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