Nonhysteretic vortex magnetic tunnel junction sensor with high dynamic reserve

Guanyang He, Yiou Zhang, Gang Xiao

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Multiple geometrical conditions for different magnetic vortex states to appear in micrometer-sized magnetic tunnel junctions (MTJs) are investigated in experiment and simulation. Both results match up well, providing clear images of vortex behaviors. We pattern a compact array of single-vortex MTJ elements and perform magnetotransport and noise measurements. This sensor features nonhysteretic behavior, a small size of 0.5 × 0.5 mm2, a low normalized noise of 10-13Hz-1, a detectability of 18nT/Hz at 1 Hz, and a large dynamic range of 100 Oe. Its 115 dB broad dynamic reserve and superior stability against temperature and environmental stray fields are ideally suited for magnetic sensing applications.
Original languageEnglish (US)
JournalPhysical Review Applied
Issue number3
StatePublished - Sep 18 2020
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2022-06-14
Acknowledgements: The work is supported by King Abdullah University of Science and Technology (KAUST) through the Sensor Initiative. Y.Z. acknowledges support from the Fermilab-Graduate Instrumentation Research Award from DOE Award No. DE-AC05-00OR22725. We use the Heidelberg MLA150 maskless aligner, which is under the support of National Science Foundation Grant No. DMR-1827453.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

ASJC Scopus subject areas

  • General Physics and Astronomy


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