title: Regulating Brownian fluctuations with tunable microscopic magnetic traps.
abstract: A major challenge to achieving positional control of fluid borne submicron sized objects is regulating their Brownian fluctuations. We present a magnetic-field-based trap that regulates the thermal fluctuations of superparamagnetic beads in suspension. Local domain-wall fields originating from patterned magnetic wires, whose strength and profile are tuned by weak external fields, enable the bead trajectories within the trap to be managed and easily varied between strong confinements and delocalized spatial excursions that are described remarkably well by simulations.
authors.affiliation: Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
authors.forename: A
authors.initials: A
authors.lastname: Chen
authors.forename: G
authors.initials: G
authors.lastname: Vieira
authors.forename: T
authors.initials: T
authors.lastname: Henighan
authors.forename: M
authors.initials: M
authors.lastname: Howdyshell
authors.forename: J A
authors.initials: JA
authors.lastname: North
authors.forename: A J
authors.initials: AJ
authors.lastname: Hauser
authors.forename: F Y
authors.initials: FY
authors.lastname: Yang
authors.forename: M G
authors.initials: MG
authors.lastname: Poirier
authors.forename: C
authors.initials: C
authors.lastname: Jayaprakash
authors.forename: R
authors.initials: R
authors.lastname: Sooryakumar
mesh_terms: D004247:DNA / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry; D008280:Magnetics; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D005290:Ferric Compounds; D058185:Magnetite Nanoparticles; C000499:ferric oxide; D004247:DNA