Figure 3

PL maps of a co-assembly with 5 nm MNPs at (A) 0 field and (B) 82 mT. (C) PL counts along the line cuts of A and B. (D) PL intensity maps as magnetic field is increased and then decreased with 5 nm MNPs. (E) Spatially-integrated PL intensities from the maps as a function of applied magnetic field. Arrows indicate the direction of magnetic field change. Scale bar: 6 μm.