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dc.contributor.authorHe, Guanyang
dc.contributor.authorZhang, Yiou
dc.contributor.authorQian, Lijuan
dc.contributor.authorXiao, Gang
dc.contributor.authorZhang, Qiang
dc.contributor.authorSantamarina, Carlos
dc.contributor.authorPatzek, Tadeusz
dc.contributor.authorZhang, Xixiang
dc.date.accessioned2018-12-16T11:19:26Z
dc.date.available2018-12-16T11:19:26Z
dc.date.issued2018-12-10
dc.identifier.citationHe G, Zhang Y, Qian L, Xiao G, Zhang Q, et al. (2018) PicoTesla magnetic tunneling junction sensors integrated with double staged magnetic flux concentrators. Applied Physics Letters 113: 242401. Available: http://dx.doi.org/10.1063/1.5052355.
dc.identifier.issn0003-6951
dc.identifier.issn1077-3118
dc.identifier.doi10.1063/1.5052355
dc.identifier.urihttp://hdl.handle.net/10754/630281
dc.description.abstractUltra-sensitive solid-state magnetic sensors are in strong demand in many applications where currently available sensors are inadequate. We have used high performance magnetic tunneling junction (MTJ) sensors and pushed the magnetic sensing limit to a high level. We have incorporated double-staged magnetic flux concentrators, one on the MTJ chip level and the other on a more macroscopic level, to amplify the external field of interest. With this approach and undergoing a process of optimization on the flux concentrators, we have increased the sensitivity of the MTJ sensor by a large factor of 517 to 775.4%/Oe in terms of magnetoresistance response. The coercivity of the sensor is only 0.12 Oe. We have achieved a detectable field limit of 30 pT/Hz⎯⎯⎯⎯⎯√ at 10 kHz. We have presented the noise spectrum and the sensitivity spectrum up to a maximum frequency of 100 kHz.
dc.description.sponsorshipThis work was supported by the National Science Foundation through Grant No. DMR-1307056 and by the King Abdullah University of Science and Technology (KAUST).
dc.publisherAIP Publishing
dc.relation.urlhttps://aip.scitation.org/doi/10.1063/1.5052355
dc.rightsThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Applied Physics Letters and may be found at http://doi.org/10.1063/1.5052355.
dc.subjectElectronic noise
dc.subjectAmplifiers
dc.subjectMagnetic ordering
dc.subjectMagnetic materials
dc.subjectThin films
dc.subjectSignal processing
dc.subjectChemical elements
dc.subjectMagnetic tunnel junctions
dc.subjectSensors
dc.subjectElectrical properties and parameters
dc.titlePicoTesla magnetic tunneling junction sensors integrated with double staged magnetic flux concentrators
dc.typeArticle
dc.contributor.departmentAli I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
dc.contributor.departmentEnergy Resources and Petroleum Engineering
dc.contributor.departmentImaging and Characterization Core Lab
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentNanofabrication Core Lab
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentThin Films & Characterization
dc.identifier.journalApplied Physics Letters
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionDepartment of Physics, Brown University, Providence, Rhode Island 02912, USA
kaust.personZhang, Qiang
kaust.personSantamarina, Carlos
kaust.personPatzek, Tadeusz
kaust.personZhang, Xixiang
refterms.dateFOA2018-12-16T11:56:52Z


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