Localized detection of reversal nucleation generated by high moment magnetic nanoparticles using a large-area magnetic sensor

Yinglong Feng, Jinming Liu, Todd Klein, Kai Wu, Jian Ping Wang

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

This report introduces a local-magnetic-reversal-nucleation based giant magnetoresistance (GMR) sensor with a large sensing area and further discusses its novel sensing scheme of high magnetic moment nanoparticles (MNPs). We demonstrated experimentally that this large-area GMR sensor could successfully detect high moment MNPs. The detection scheme of localized reversal nucleation of GMR sensor induced by MNPs was analyzed and further confirmed by the micromagnetic simulations. This work may provide one pathway in designing next generation GMR biosensors with large area and high sensitivity. This sensing scheme could be applicable to other magnetic biosensors such as magnetic tunnel junction sensors and planar Hall sensors.

Original languageEnglish (US)
Article number123901
JournalJournal of Applied Physics
Volume122
Issue number12
DOIs
StatePublished - Sep 28 2017

Bibliographical note

Funding Information:
This work was partially supported by the U.S. Department of Defense under the Ovarian Cancer Translational Pilot Award, Institute of Engineering in Medicine seed grant, Office for Technology Commercialization (OTC) Innovation grant, and the resident fellows grant of the Institute on the Environment (IonE) at the University of Minnesota. Parts of this work were carried out in the Characterization Facility, University of Minnesota, which receives partial support from National Science Foundation through the MRSEC program.

Publisher Copyright:
© 2017 Author(s).

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