Video demonstration of the Ultra High Magnetic Response (UHMR) platelets

The response of maghemite-coated alumina platelets suspended in a solution to an applied magnetic field stimuli was directly observed and filmed using an optical microscope in both transmission and reflection modes . Free-floating platelets indeed exhibited the UHMR and rapidly aligned their long axes parallel to the applied magnetic field. Smaller (~1 μm) particulates present in the solution experienced intense Brownian motion, confirming that this method is not viable for aligning sub-micron crystallites.