Figure 2.

Néel relaxation. A mylar substrate with liposomes containing the FLAG epitope generates a large relaxation signal (trace A) in the presence of anti-FLAG labeled nanoparticles. Liposomes with no FLAG (trace B), and nanoparticles alone (trace C) generate very little response. A small exponential background decay (trace D) caused by eddy currents in the microscope is present when there is no sample. (Inset) An expanded view of the lower three traces. Fits are in dotted lines. The background decay (trace D) was subtracted from traces A, B, and C before fitting.