Measurements of Brownian relaxation of magnetic nanobeads using planar Hall effect bridge sensors

Østerberg, F. W.Dept of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech, Kongens Lyngby, Danmark (author)

We compare measurements of the Brownian relaxation response of magnetic nanobeads in suspension using planar Hall effect sensors of cross geometry and a newly proposed bridge geometry. We find that the bridge sensor yields six times as large signals as the cross sensor, which results in a more accurate determination of the hydrodynamic size of the magnetic nanobeads. Finally, the bridge sensor has successfully been used to measure the change in dynamic magnetic response when rolling circle amplified DNA molecules are bound to the magnetic nanobeads. The change is validated by measurements performed in a commercial AC susceptometer. The presented bridge sensor is, thus, a promising component in future lab-on-a-chip biosensors for detection of clinically relevant analytes, including bacterial genomic DNA and proteins.

TEKNIK OCH TEKNOLOGIER Nanoteknik hsv//swe
ENGINEERING AND TECHNOLOGY Nano-technology hsv//eng
TECHNOLOGY
TEKNIKVETENSKAP
Engineering Science with specialization in Solid State Physics
Teknisk fysik med inriktning mot fasta tillståndets fysik
Engineering Science with specialization in Nanotechnology and Functional Materials
Teknisk fysik med inriktning mot nanoteknologi och funktionella material

Rizzi, G.Dept of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech, Kongens Lyngby, Danmark (author)
Zardán Gómez de la Torre, TeresaUppsala universitet,Nanoteknologi och funktionella material,Nanoteknologi och funktionella material, Nanotechnology and Functional Materials(Swepub:uu)terza442 (author)
Strömberg, MattiasUppsala universitet,Nanoteknologi och funktionella material,Nanoteknologi och funktionella material, Nanotechnology and Functional Materials(Swepub:uu)makar103 (author)
Strømme, MariaUppsala universitet,Nanoteknologi och funktionella material(Swepub:uu)mst26208 (author)
Svedlindh, PeterUppsala universitet,Fasta tillståndets fysik(Swepub:uu)petesved (author)
Hansen, M. F.Dept of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech, Kongens Lyngby, Danmark (author)
Dept of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech, Kongens Lyngby, DanmarkNanoteknologi och funktionella material (creator_code:org_t)

By the author/editor: Østerberg, F. W.; Rizzi, G.; Zardán Gómez de ...; Strömberg, Matti ...; Strømme, Maria; Svedlindh, Peter; show more...; Hansen, M. F.; show less...

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