title: Dynamic micro-Hall detection of superparamagnetic beads in a microfluidic channel.
abstract: We report integration of an InAs quantum well micro-Hall magnetic sensor with microfluidics and real-time detection of moving superparamagnetic beads. Beads moving within and around the Hall cross area result in positive and negative Hall voltage signals respectively. Relative magnitudes and polarities of the signals measured for a random distribution of immobilized beads over the sensor are in good agreement with calculated values and explain consistently the shape of the dynamic signal.
authors.affiliation: Department of Physics and MARTECH, Florida State University, Tallahassee, FL 32306, United States.
authors.forename: K
authors.initials: K
authors.lastname: Aledealat
authors.forename: G
authors.initials: G
authors.lastname: Mihajlović
authors.forename: K
authors.initials: K
authors.lastname: Chen
authors.forename: M
authors.initials: M
authors.lastname: Field
authors.forename: G J
authors.initials: GJ
authors.lastname: Sullivan
authors.forename: P
authors.initials: P
authors.lastname: Xiong
authors.forename: P B
authors.initials: PB
authors.lastname: Chase
authors.forename: S
authors.initials: S
authors.lastname: von Molnár