Abstract
Ferromagnetic resonance (FMR) experiments on non-interacting maghemite (γ-Fe 2O 3) nanoparticles in ferrofluids, are performed in X- and Q-bands as a function of the particle diameter (4.8–10 nm) and the temperature (3.5–300 K). The colloidal stability and grain size are controlled through a chemical synthesis, the polydispersity being reduced by a phase separation method. The dependencies of spectral characteristics with temperature T, particle volume V and experimental frequency ω, reveal a generic behavior of the FMR lines due to the effect of thermal fluctuations. Their scaling with the Langevin parameter ξ 0= MVω/ γk B T is explained in the framework of the theory of FMR for an assembly of independent single-domain anisotropic particles.
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