Journal
ACS NANO
Volume 9, Issue 10, Pages 10165-10172Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b03783
Keywords
ferromagnetic materials microstructures; nanoparticles; particle deposition; self-assembly
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Funding
- University of Florida Office of Research
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This article describes a versatile method to fabricate magnetic microstructures with complex two-dimensional geometric shapes using magnetically assembled iron oxide (Fe3O4) and cobalt ferrite (CoFe2O4) nanoparticles. Magnetic pole patterns are imprinted into magnetizable media, onto which magnetic nanoparticles are assembled from a colloidal suspension into defined shapes via the shaped magnetic field gradients. The kinetics of this assembly process are studied by evaluation of the microstructure features (e.g., line width and height) as a function of time, particle type, and volume fraction. After assembly, the iron oxide particles are cross-linked in situ and subsequently released by dissolving a sacrificial layer. The free-floating magnetic structures are shown to retain their patterned shape during manipulation with external magnetic fields.
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