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 language||English (US)|
|Journal||Physical Review Applied|
|State||Published - Sep 18 2020|
Bibliographical noteKAUST 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
- Physics and Astronomy(all)