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Thin-film superparamagnetic resonance in a nanoparticle array
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View: Figures


Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

Resonance frequencies for normal configuration (nc), calculated according to Eq. (1), as in Fig. 2.

Image of FIG. 5.
FIG. 5.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Thin-film superparamagnetic resonance in a γ-Fe2O3 nanoparticle array