  Methods to fabricate and characterize monodisperse magnetic nanoplatelets for
fluid/bio-based applications based on spintronic thin-film principles are a
challenge. This is due to the required top-down approach where the transfer of
optimized blanket films to free particles in a fluid while preserving the
magnetic properties is an uncharted field. Here, we explore the use of
substrate conformal imprint lithography (SCIL) as a fast and cost-effective
fabrication route. We analyze the size distribution of nominal 1.8 um and 120
nm diameter platelets and show the effect of the fabrication steps on the
magnetic properties which we explain through changes in the dominant
magnetization reversal mechanism as the size decreases. We show that SCIL
allows for efficient large-scale platelet fabrication and discuss how
application-specific requirements can be solved via process and material
engineering.
