Controlled transport of superparamagnetic beads with spin-valves
Wendy R. Altman, John M. Moreland, Stephen E. Russek, Bruce W. Han, Victor M. Bright
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.
, Moreland, J.
, Russek, S.
, Han, B.
and Bright, V.
Controlled transport of superparamagnetic beads with spin-valves, Small, [online], https://doi.org/10.1063/1.3645615
(Accessed June 3, 2023)