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Conference Paper: Detection of iron-oxide magnetic nanoparticles using magnetic tunnel junction sensors with conetic alloy

TitleDetection of iron-oxide magnetic nanoparticles using magnetic tunnel junction sensors with conetic alloy
Authors
KeywordsIron-oxide magnetic nanoparticles
Magnetic sensors
Magnetic tunnel junction (MTJ)
Biosensor applications
External magnetic field
Issue Date2011
PublisherIEEE. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=20
Citation
The 2011 IEEE International Magnetics Conference (INTERMAG 2011), Taipei, Taiwan, 25-29 April 2011. In IEEE Transactions on Magnetics, 2011, v. 47 n. 10, p. 2577-2580 How to Cite?
AbstractWe demonstrated the detection of 20-nm iron-oxide magnetic nanoparticles (MNPs) using Al2 O3 magnetic tunnel junction sensors (MTJs) with Conetic alloy. Conetic alloy Ni77Fe14Cu 5Mo4 was deposited as the MTJ free layer and pinned layer due to its magnetically soft properties. The magnetoresistance (MR) curves of MTJs with Conetic alloy showed tunneling magnetoresistance of 8.0% with small hysteresis and high linearity in the sensing region, after applying an external magnetic field of 14 Oe along the hard axis. The sensitivity of the MTJ sensors with Conetic alloy was determined to be 0.3%/Oe within a linear region at room temperature. The MNPs of three different concentrations were successfully detected by the shifts of the MR loops of the MTJs, and it was observed that the resistance deviations of the MTJ sensors increased with the logarithm of MNP concentrations. The maximum resistance deviation was 0.16 Ω for an MNP concentration of 20.0 mg/mL. MTJ sensors, together with MNPs, are a promising platform for future biosensor applications, and this paper shows that Conetic alloy is feasible for improving the performance of this platform. © 2011 IEEE.
DescriptionThis journal issue contain selected papers of the 2011 IEEE International Magnetics (INTERMAG) Conference, Taipei, Taiwan, 25-29 April 2011.
Persistent Identifierhttp://hdl.handle.net/10722/137297
ISSN
2015 Impact Factor: 1.277
2015 SCImago Journal Rankings: 0.602
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLei, ZQ-
dc.contributor.authorLeung, CW-
dc.contributor.authorLi, L-
dc.contributor.authorLi, GJ-
dc.contributor.authorFeng, G-
dc.contributor.authorCastillo, A-
dc.contributor.authorChen, PJ-
dc.contributor.authorLai, PT-
dc.contributor.authorPong, PWT-
dc.date.accessioned2011-08-26T14:22:43Z-
dc.date.available2011-08-26T14:22:43Z-
dc.date.issued2011-
dc.identifier.citationThe 2011 IEEE International Magnetics Conference (INTERMAG 2011), Taipei, Taiwan, 25-29 April 2011. In IEEE Transactions on Magnetics, 2011, v. 47 n. 10, p. 2577-2580-
dc.identifier.issn0018-9464-
dc.identifier.urihttp://hdl.handle.net/10722/137297-
dc.descriptionThis journal issue contain selected papers of the 2011 IEEE International Magnetics (INTERMAG) Conference, Taipei, Taiwan, 25-29 April 2011.-
dc.description.abstractWe demonstrated the detection of 20-nm iron-oxide magnetic nanoparticles (MNPs) using Al2 O3 magnetic tunnel junction sensors (MTJs) with Conetic alloy. Conetic alloy Ni77Fe14Cu 5Mo4 was deposited as the MTJ free layer and pinned layer due to its magnetically soft properties. The magnetoresistance (MR) curves of MTJs with Conetic alloy showed tunneling magnetoresistance of 8.0% with small hysteresis and high linearity in the sensing region, after applying an external magnetic field of 14 Oe along the hard axis. The sensitivity of the MTJ sensors with Conetic alloy was determined to be 0.3%/Oe within a linear region at room temperature. The MNPs of three different concentrations were successfully detected by the shifts of the MR loops of the MTJs, and it was observed that the resistance deviations of the MTJ sensors increased with the logarithm of MNP concentrations. The maximum resistance deviation was 0.16 Ω for an MNP concentration of 20.0 mg/mL. MTJ sensors, together with MNPs, are a promising platform for future biosensor applications, and this paper shows that Conetic alloy is feasible for improving the performance of this platform. © 2011 IEEE.-
dc.languageeng-
dc.publisherIEEE. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=20-
dc.relation.ispartofIEEE Transactions on Magnetics-
dc.rightsIEEE Transactions on Magnetics. Copyright © IEEE.-
dc.rights©2011 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectIron-oxide magnetic nanoparticles-
dc.subjectMagnetic sensors-
dc.subjectMagnetic tunnel junction (MTJ)-
dc.subjectBiosensor applications-
dc.subjectExternal magnetic field-
dc.titleDetection of iron-oxide magnetic nanoparticles using magnetic tunnel junction sensors with conetic alloy-
dc.typeConference_Paper-
dc.identifier.emailLai, PT: laip@eee.hku.hk-
dc.identifier.emailPong, PWT: ppong@eee.hku.hk-
dc.identifier.authorityLai, PT=rp00130-
dc.identifier.authorityPong, PWT=rp00217-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1109/TMAG.2011.2157099-
dc.identifier.scopuseid_2-s2.0-80053508220en_HK
dc.identifier.hkuros191532-
dc.identifier.hkuros220397-
dc.identifier.hkuros225733-
dc.identifier.hkuros227860-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80053508220&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume47-
dc.identifier.issue10-
dc.identifier.spage2577-
dc.identifier.epage2580-
dc.identifier.isiWOS:000296418200063-
dc.publisher.placeUnited States-
dc.identifier.scopusauthoridLei, ZQ=37002974000en_HK
dc.identifier.scopusauthoridLeung, CW=22958301300en_HK
dc.identifier.scopusauthoridLi, L=53866588500en_HK
dc.identifier.scopusauthoridLi, GJ=37002991600en_HK
dc.identifier.scopusauthoridFeng, G=17434031700en_HK
dc.identifier.scopusauthoridCastillo, A=53866216200en_HK
dc.identifier.scopusauthoridChen, PJ=7408353881en_HK
dc.identifier.scopusauthoridLai, PT=7202946460en_HK
dc.identifier.scopusauthoridPong, PWT=24071267900en_HK
dc.customcontrol.immutablesml 130905 ; 160105 - merged-

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