Keywords: Contrast Agent, Cell Tracking & Reporter Genes, Magnetocaloric materialWe present progress towards smaller magnetocaloric samples, that drastically change magnetic moment and hence T2* contrast when switched with external magnetic field or temperature, with the eventual goal of achieving a size appropriate for cell tracking. To that end a FeRh sample was microfabricated with a thickness of 200 nm, and patterned with varying linear dimensions from 500 micron down to 1 micron square. We demonstrate that this sample may be switched with temperature and with external field through imaging at 4.7 and 11.7T and with the application of pulsed B0 insert coil.
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