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- W2056513816 abstract "We report a broadband 1H NMR study of the spin dynamics of coated maghemite and gold–maghemite hybrid nanostructures with two different geometries, namely dimers and core–shells. All the samples have a superparamagnetic behavior, displaying a blocking temperature (TB ∼ 80 K (maghemite), ∼105 K (dimer), ∼150 K (core–shell)), and the magnetization reversal time follows the Vogel–Fulcher law. We observed three different anomalies in 1H NMR T1–1 versus T that decrease in amplitude when increasing the applied magnetic field. We suggest that the anomalies are related to three distinct system dynamics: molecular rotations of the organic groups (240 < T < 270 K), superparamagnetic spin blockage (100 < T < 150 K), and surface–core spin dynamics (T < 25 K). By fitting the T1–1 data with a heuristic model, we achieved a good agreement with magnetic relaxation data and literature values for methyl group rotation frequencies." @default.
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- W2056513816 date "2015-01-02" @default.
- W2056513816 modified "2023-10-01" @default.
- W2056513816 title "Spin Dynamics in Hybrid Iron Oxide–Gold Nanostructures" @default.
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- W2056513816 doi "https://doi.org/10.1021/jp509411v" @default.
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