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dc.contributor.authorHe, Guanyang
dc.contributor.authorZhang, Yiou
dc.contributor.authorHu, Yuebin
dc.contributor.authorZhang, Xixiang
dc.contributor.authorXiao, Gang
dc.date.accessioned2021-07-11T07:08:12Z
dc.date.available2021-07-11T07:08:12Z
dc.date.issued2021-07-08
dc.date.submitted2020-12-28
dc.identifier.citationHe, G., Zhang, Y., Hu, Y., Zhang, X., & Xiao, G. (2021). Magnetic Tunnel Junction based Gradiometer for Detection of Cracks in Cement. Sensors and Actuators A: Physical, 112966. doi:10.1016/j.sna.2021.112966
dc.identifier.issn0924-4247
dc.identifier.doi10.1016/j.sna.2021.112966
dc.identifier.urihttp://hdl.handle.net/10754/670103
dc.description.abstractMagnetic flux leakage (MFL) testing is a widely used technology for detecting structural defects in industry, where new magnetic sensors can provide an enhanced detectability. We have fabricated and developed vortex magnetic tunnel junctions (MTJs) into a new MFL probe, by designing a well-balanced magnetic gradiometer with a base length of 4 cm. Such gradiometer has exhibited a field detectability of 1.6 𝑛𝑇/√𝐻𝑧 at 1 kHz, and a superior common-mode rejection ratio (CMRR) of 82 dB. We have studied multiple configurations of crack detection in weakly magnetic cement by simulations, and provided corresponding experimental confirmations by this MFL probe. It has achieved a large standoff distance of 22 mm, which finds its applications in energy industry and other infrastructural systems.
dc.description.sponsorshipThis work was supported by King Abdullah University of Science and Technology (KAUST) through the Sensor Initiative. We thank colleagues at KAUST for discussion and collaboration. Y.Z. acknowledges support from Fermilab-Graduate Instrumentation Research Award from DOE grant number DE-AC05-00OR22725. We used the Heidelberg MLA150 Maskless Aligner, which was under the support of a National Science Foundation Grant No. DMR-1827453.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0924424721004313
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Sensors and Actuators A: Physical. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Sensors and Actuators A: Physical, [, , (2021-07)] DOI: 10.1016/j.sna.2021.112966 . © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleMagnetic Tunnel Junction based Gradiometer for Detection of Cracks in Cement
dc.typeArticle
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalSensors and Actuators A: Physical
dc.rights.embargodate2023-07-01
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Physics, Brown University, Providence, RI 02912, USA.
dc.identifier.pages112966
kaust.personZhang, Xixiang
dc.date.accepted2021-07-02
refterms.dateFOA2021-07-11T07:29:44Z
kaust.acknowledged.supportUnitSensor Initiative
dc.date.published-online2021-07-08
dc.date.published-print2021-11


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