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

ASJC Scopus subject areas

  • General Physics and Astronomy


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