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On‐chip control of magnetic particles
Author(s) -
Rinklin Philipp,
Krause HansJoachim,
Wolfrum Bernhard
Publication year - 2012
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201100529
Subject(s) - micrometer , materials science , passivation , chip , particle (ecology) , nanotechnology , optoelectronics , nanometre , magnet , magnetic particle inspection , magnetic nanoparticles , optics , physics , layer (electronics) , electrical engineering , composite material , engineering , nanoparticle , oceanography , geology
We describe an on‐chip system to control the actuation of micrometer‐ and nanometer‐sized magnetic particles. Orthogonal conducting microwire arrays are used to induce magnetic fields with highly localized peaks and strong local gradients. These fields are then applied in actuation experiments to generate defined particle movement with micrometer precision. We examine different types of current sequences to efficiently move and separate the particle cloud on the chip without the use of external magnets. The final protocol allows efficient and reliable control over the particle cloud's position minimizing the loss of particles during the individual switching steps.Schematic of a microwire chip controlling a cloud of particles (black). The chips are processed on silicon (blue). The microwires consist of Au (yellow) and are insulated with an oxide nitride passivation layer (green transparent).