A giant magnetoresistance ring-sensor based microsystem for magnetic bead manipulation and detection

Chinthaka Pasan Gooneratne, Ioanna Giouroudi, Cai Liang, Jürgen Kosel

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

In this paper a novel spin valvegiant magnetoresistance(GMR) ring-sensor integrated with a microstructure is proposed for concentrating, trapping, and detecting superparamagnetic beads (SPBs). Taking advantage of the fact that SPBs can be manipulated by an external magnetic field, a unique arrangement of conducting microrings is utilized to manipulate the SPBs toward the GMR sensing area in order to increase the reliability of detection. The microrings are arranged and activated in such a manner so as to enable the detection of minute concentrations of SPBs in a sample. Precise manipulation is achieved by applying current sequentially to the microrings. The fabricated ring-shaped GMR element is located underneath the innermost ring and has a magnetoresistance of approximately 5.9%. By the performed experiments it was shown that SPBs could be successfully manipulated toward the GMR sensing zone.
Original languageEnglish (US)
Pages (from-to)07E517
JournalJournal of Applied Physics
Volume109
Issue number7
DOIs
StatePublished - Mar 29 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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