Altman, W.
, Moreland, J.
, Russek, S.
, Han, B.
and Bright, V.
(2011),
Controlled transport of superparamagnetic beads with spin-valves, Small, [online], https://doi.org/10.1063/1.3645615
(Accessed October 8, 2025)
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Controlled transport of superparamagnetic beads with spin-valves
Published
Author(s)
, , , Bruce W. Han, Victor M. Bright
Abstract
Trapping, release, and transport of individual or ensembles of 2.8 υm superparamagnetic beads functionalized with streptavidin were demonstrated using an addressable and non-volatile array of spin-valve (SV) traps integrated into a microfluidic channel. The linear array consists of two staggered lines of 1 υm × 8 υm SVs toggled "on" or "off" using 10 ms 150 mΑ or -100 mΑ current pulses, respectively. The bead is trapped when the SV is on and released or ignored when the SV is off. This "switchable permanent magnet" offers a low power alternative to other precision microfluidic transport devices.Citation
Small
Volume
99
Issue
14
Pub Type
Journals
Download Paper
Keywords
superparamagnetic beads, spin-valve (SV) traps, switchable permanent magnet, microfluidic transport devices, addressable and non-volatile array
Citation
Issues
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Created October 6, 2011, Updated October 12, 2021