Bead magnetorelaxometry with an on-chip magnetoresistive sensor
2011 (English)In: Lab on a Chip, ISSN 1473-0197, E-ISSN 1473-0189, Vol. 11, no 2, 296-302 p.Article in journal (Refereed) Published
Magnetorelaxometry measurements on suspensions of magnetic beads are demonstrated using a planar Hall effect sensor chip embedded in a microfluidic system. The alternating magnetic field used for magnetizing the beads is provided by the sensor bias current and the complex magnetic susceptibility spectra are recorded as the 2nd harmonic of the sensor response. The complex magnetic susceptibility signal appears when a magnetic bead suspension is injected, it scales with the bead concentration, and it follows the Cole-Cole expression for Brownian relaxation. The complex magnetic susceptibility signal resembles that from conventional magnetorelaxometry done on the same samples apart from an offset in Brownian relaxation frequency. The time dependence of the signal can be rationalized as originating from sedimented beads.
Place, publisher, year, edition, pages
2011. Vol. 11, no 2, 296-302 p.
Engineering and Technology
Research subject Engineering Science with specialization in Solid State Physics; Engineering Science with specialization in Nanotechnology and Functional Materials
IdentifiersURN: urn:nbn:se:uu:diva-133956DOI: 10.1039/c0lc00002gISI: 000285514700015PubMedID: 20978654OAI: oai:DiVA.org:uu-133956DiVA: diva2:371173