Magnetic resonance of nanoparticles in a ferrofluid: evidence of thermofluctuational effects
作者： F. Gazeau , V. Shilov , J.C. Bacri , E. Dubois , F. Gendron
DOI: 10.1016/S0304-8853(99)00156-0
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摘要: Ferromagnetic resonance (FMR) experiments on non-interacting maghemite (c-Fe 2 O 3 ) nanoparticles in ferro#uids, are performed X- and Q-bands as a function of the particle diameter (4.8}10 nm) temperature (3.5}300 K). The colloidal stability grain size controlled through chemical synthesis, polydispersity being reduced by phase separation method. dependencies spectral characteristics with „, volume< experimental frequency u, reveal generic behavior FMR lines due to e!ect thermal #uctuations. Their scaling Langevin parameter m 0 "M
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