Fig. 5
From: Field switching of microfabricated metamagnetic FeRh MRI contrast agents
Particle switching demonstration with the intermediate structures. With the temperature held at 48.4°C, the image series in A was acquired. Following an initial image a 25 ms Gaussian pulse of 0.77T was applied with the B0 insert (shown in B), effectively raising the magnetic field to 5.47 T very briefly over the sample. Following a subsequent image, a -0.77T amplitude pulse was applied. The hysteresis curve, shown in C, switches the magnetic moment between ON and OFF states, allowing a subsequent MRI acquisition with switching T2* contrast. This was repeated three times to obtain the image series shown in A. Plots of the mean image intensity for four of the particles are shown in (D), using the ROIs shown. For the 10 μm particle, the minimum intensity in the ROI was used.
