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TEM image of 1–2 monolayers of nanoparticles. Light and dark regions correspond to single- and double-monolayer regions, respectively. Local hexagonal ordering is clearly seen; an average center-to-center spacing of is identified in one-monolayer regions.
Broadband FMR measurements of SP thin film. Left: pc measurements of , for field orientations of 0, 45, and 90° to sample flat. Right: nc measurements of . See text for details.
Resonance frequencies , for different field orientations , in-plane (pc) configuration, from Fig. 2, left. Model calculations for thin-film superparamagnetic resonance [Eq. (1)], varying volume fraction from TEM-measured . See text for details.
Resonance frequencies for normal configuration (nc), calculated according to Eq. (1), as in Fig. 2.
Swept-field peak-to-peak linewidths for the pc resonance data in Fig. 2, left. The calculated effects of 10% dispersions in SP NC size and coverage are indicated with anisotropy field dispersion . See text for details.
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